Do Rory and Blsze have any outwardly difference in looks at all or does cartoon logic apply here and they are really „truly“ identical twins? We know even their parents can’t tell them apart at first glance but is there anything that would give them away at closer inspection like a crooked tooth or Blaze having more calloused hands or just something like „Blaze has a freckle on his left buttcheek while Rory has one on the right.“?
Cartoon logic applies, they are carbon copies BUT!
This tends to evolve as they are growing up. They got the same body at birth, but they have totally different way of living, so their bodies will change accordingly. I have to work on the topic a bit but globally :
Blaze will globally be more muscular and toned than his brother, since his hyperactive ass run everywhere around the desk while his brother spend his days in his workshop working on his crafts. He will probably have moles that his brother don't have, and a lot of (very stupidely obtained) scars.
Rory will be paler and more skinny, for the same reason we talked above. While he will not have stupid scars like Blaze ("I juggled with knives while I can't juggle" style), he may have gained marks from more serious injuries due to his researches. Chemical burns, this kind of stuff. Also has dark rings around the eyes while his brother don't.
But globally, if you want to differenciate them, just ask them to speak.