Every pet store owner in creation has their ball pythons and corns sharing tanks. And while those animals are often poorly quarantined etc. etc., except in the cases of actual disease and poor husbandly, they generally eat just fine and are, if anything, less stressed by human handling. (Though presumably living in a pet store means they also get handled more than the average ball python.)

Seriously, someone should actually study this. I've seen research on certain species rattlesnakes that share denning space, and prefer to hang with their siblings, even if they've been separated most of their lives.