I have a tool for setting the seat, using the valve. I don't think that a 2.25 would even work on a seat for a 2.20, and if they were re-cut to 2.20 that would have sunk them noticeably.
I'm confused also. So one seat is cut for 2.25 and it has a 2.20 valve on it. Or one valve is 2.25?

I think that next time these get a freshen, I would determine the throat and decide at that point if the 2.20 is ok, or if it needs to go to 2.25 to get them proportionally right, and put a good valve job on them. I don't like that intake seat geometry at all. Just doesn't look touched at all.