I've been playing the hell out of this game on the Switch's SNES collection and I was wondering if I could use this copy of the game to speedrun it on this leaderboard!

I guess it should be OK. Note though, that the japanese version is the fastest - I don't know if this version is available on VC (virtual console).

I asked the same question in the ALTTP forums. They are a huge speedrun community, maybe somebody did already do some testing there and has more experience regarding this matter.

Having said all that, if you're just starting to speedrun DC, I guess it's definitely OK to start practicing and getting your first runs in on VC.

I think it should be fine. You can try runs and I can compare it to snes runs to see if it differs at some point, but I don't think so