To help clarify, it seems that the offers, both at only Asda, Morrisons, Tesco from 13/2 to 16/2:

Quidco ClickSnap offer = "buy 1, get £1.00 cashback" and "Redeem 3 times" from 13/2 to 16/2
So you can claim the offer up to 3 times in total during the offer period either on one or more receipts.
That £1/item cashback will be awarded regardless of the line item price on the receipt, or net cost after any multibuy promos on the receipt.
ie should get £1.00 per item and cashback goes into general Quidco pot that you can withdraw when you wish, and potentially get bonus % added - eg via Amazon gift voucher.

CheckoutSmart App offer = "Free" and "3 claims"
From past experience that "Free" will be based on the line item price on the receipt, and not any later multibuy reduced price. Again 3 claims means you can make the claim for up to 3 offer items, all on the same receipt if you wish.
So "Free" rather than fixed £1 back, and cashback goes into your CoS a/c balance where you need to build up £20+ to withdraw without a 5% penalty.

Past experience is that "A claim of this offer may only be sumitted once across the CheckoutSmart published network..." means a single receipt may only be uploaded/submitted ONCE to any CoS network site [ie all CheckoutSmart offers, all Quidco ClickSnap offers and those TCB S&S offers where the T&Cs say they are provided by the CoS network] and not that any individual is restricted to just one claim of the offer.
ie As OP says - buy your items on 2 separate receipts to submit claims to the 2 separate cashback sites/Apps.

This is the list published by Quidco ClickSnap as valid products for this offer:

Schwartz Authentic Sausage Casserole Mix 35g
Schwartz mix creamy pepper sauce 25g
Schwartz Mix Garlic Mushroom & Cream Sauce 26g
Schwartz Authentic Mix Somerset Pork 36G
Schwartz Authentic Mix Beef Casserole 43G
Schwartz Slow Cooker Chicken Provencal 35G
Schwartz Authentic Mix For Lasagne 36G
Schwartz Mix Creamy Parsley Sauce 26g
Schwartz for fish Hollandaise sauce mix 25g
Schwartz Slow Cooker Beef And Ale Stew 43G
Schwartz Authentic Chicken Casserole Mix 36G
Schwartz Sauce Mixes Luxury Bread 40G
Schwartz Slow Cookers Chicken In Red Wine 35G
Schwartz Authentic Bombay Potatos 33g
Schwartz Creamy Mild Peppercorn Sauce 25G
Schwartz Mix For Cheddar Cheese Sauce 40G
Schwartz Slow Cookers Sausage And Bean Casserole 35G
Schwartz Mix Dauphinoise Potato Bake 40g
Schwartz Creamy Chicken & Leek Bake Recipe Mix 36g
Schwartz Authentic Sauce Mixes For Chicken Chasseur 40G
Schwartz Slow Cooker Pulled Pork Recipe Mix 35g
Schwartz Spaghetti Carbonara Casserole Mix32g
Schwartz Hot Chilli Con Carne Casserole Mix41g
Schwartz Slow Cooker Recipe Mix Chicken Curry 33G
Schwartz Mediterranean Roasted Vegetables 30g
Schwartz Authentic Tuna Napolitana Mix 30G
Schwartz Authentic Sauce Mixes For Shepherds Pie 38G
Schwartz Chilli Con Carne Recipe Mix 41G
Schwartz Authentic Spaghetti Bolognese Sauce Mix 40G
Schwartz Slow Cookers Beef And Tomato Casserole 40G
Schwartz Potato Wedge Garlic & Herb Mix 38G

FINAL TIP if planning to buy in Tesco
Check your TopcashBack Snap & Save offers - you've probably got a couple of fresh freebies lurking in there
(both from CoS Network, not just from TCB)

ie another week's offer ie between 10/2 to 16/2 of Fire & Smoke 100g Turkey slices (£1.30 worth) - loose meat's counter
and another week's offer ie between 10/2 and 16/2 of Optiwell yoghurt drink (£1.80 worth) - this is NOT a chilled item.
BUT do buy these on another separate receipt ie NOT combined with your Schwartz mixes as they'd be counting that as submitting the receipt to the CoS network and TCB S&S are offering only 35p for mixes!
Having claimed Optiwell £1.80/free on TCB S&S you can't then use that receipt to claim another 35p on QCS as that receipt has already been used once on the CoS Network!

Cheers got mine the other day on the 2 for £1 and got back £1.76

Hi KiKai,
Thanks for the post.
I notice COS, CS and TCB are all saying if you get the deal from one you cannot get the deal from the other sites. I recently had a "Deli Fire & Smoke turkey slices" claim denied and am waiting for confirmation for TCB as to why, but suspect this is the reason. Have you come across this problem yet?
Feel free to ignore the question if you are to busy and if my life is ruined because of your rejection, I don't want you to dwell on it for more than a few years. :laughing:

I don't fully understand.
With CS it's £1 cashback so you can get 6 free.
With COS it says it's free so on the receipt will the receipt not print individual prices after the discount?

Not for me my Checkoutsmart showed as claim for 3 on Wednesday and they were 2 for £1 at morrisons so i went for that and got .76p profit . Cheers

They are "partners" so share info with each other.

It says I can claim 3 times KIKAI so how did you get 6? Thanks.

Thank you kikai, heat added :smiley:

​if two different receipts they wouldn't. I always get two lots of the offer products but just do two transactions so two separate receipts and can claim on both apps.