there are really no differences between the two as far as grow needs but those pics don't look like sativa's...those fat short leaves in the 1st pic tells me it's indica and it's not at all unusual to see different phenotypes coming out of bagseed which would explain the different looks with the plants. and 91 for short periods isn't that bad. my outdoor plants are doing very well in the 100+ heat...they just take more water right now. the main thing is keeping the roots as cool as possible...

and good luck with your surgery! had my left knee replaced years ago from a motorcycle wreck and it's no picnic...