Does everything from a kayak fit a canoe?

I am buying fishing equipment for my canoe. But everything says kayak this kayak that. I just want to make sure that most of that stuff such as fishing rod holders and gopro stuff would fit on a canoe just as well as a Kayak.

Would have to see what you are looking at. Much of what you do to setup a boat is somewhat custom. How do they mount? Some rod holders use a track system, which would be hard to mount on a canoe, or some go through the top deck, which you don’t have. What specifically are you looking at?

I’m mostly looking at the rod holders with the C clamps.

No. Usually they don’t.
Dogs, kids and Coleman stoves often don’t fit either. It is why I have given up on kayaks.