I have a question: I know some devices to speedrun Mario is a bit slower is a Famicom classic one of them I tried to find the answer on the internet but I can't find any? , and I heard that the framerate between the NES classic and a Famicom classic is different?, I don't know if they are

NES Classic and FC Classic should be the same framerate. That being said, both of them are capped at a flat 60 FPS because they are HDMI output consoles. The HDMI itself is capped at 60 FPS, so there's not really anything you can do there. Essentially, you lose half a second over NES/Emulator every 5 minutes. If you're not going for sub 5:00 Any% times or high level Warpless times, the time loss isn't that big of a deal in my opinion.