things definitely do not need to match when it comes to accessories. with all white cabinets and counters bringing in pattern and / or color might be smart.. not sure why you dont want backs on all 4??

here are 1. texture or 2.color or 3.wood . do you know what allowable width you have across the long side ? can the legs angle out or no ? .but I'd try for chairs w backs on all 4. shopping for this sort of product is quite easy and ample choices on internet. I like each of these for different reasons.

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Thanks! Don’t have room for them to angle out. The reason I don’t want a back on the one on the end is there isn’t enough clearance I’d prefer to be able to fully push it under when not using. Thanks for your suggestions..