That is entirely possible that it is indeed maple, I'm quite new at this and I was trying to go with what was remembered from when it was made.
I didn't think that the top was veneered, I'll try to go take some pictures of the sides of the extension/top when the 2 sides meet. that should make it obvious if it's a veneered top correct?
new finish for sure as the current one has a couple spots with issues like in the second to last picture. I guess changing the colour would be dependant on whether or not this is a veneered top as well as which wood that actually is.