Difference is very little to be diving into it. Actually (from my experience) trying to remember details like that is not helpful at all. They easily go away from memory and next time you dealt this texture you wont remember exactly what you suppose to be doing. Which is quite frustrating (I can provide quite easy example - have you found yourself sometimes in common preflop spot and had some hand which you aren't sure call/fold. For example 3Bet SBvsBU and you have K7s, you are thinking that is it close between all 3 options, but you aren't exactly sure about %. Or vs CO open you have Q2s which is marginal call at best ( vs 2.5x below nl1000 rake). That happens all the time)

A7c and A7d have bdfd to go with; while A7h aslo blocking his 7x. Which by the way shouldn't be massive deal on the flop, because ranges are still wide and blocking 2 combos where IP have 500 combos isn't crazy. On the river this of course changes when you x/R; overbet turn and push river; but still it is not like his A6 and 76 only nuts he can possible have

Its not about memorizing its about understand the mechanics. And me, in game, i would pure xR A7hh as it blocks 67s and A6s AND has backdoor nutflushdraw and never xR A7dd ss or cc as they only block or have bdfd but dont have both. So i would just choose the combo that has backdoor equity AND blocks. Well, solver says i am wrong - and i wonder why?