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Worth noting that JSC on iOS for use in app-backend/business-logic code runs in interpreted mode [1].

Are Android versions of RN apps faster because Android's native V8 allows JIT, and Hermes also employs JIT?

RN on Android also uses JSC, so no JIT. And, and per the video (https://www.youtube.com/watch?v=zEjqDWqeDdg&feature=youtu.be...) there is no JIT on Hermes either.

JSC on Android can use JIT, but some choose to disable it because it uses more memory than it’s worth.