Q#2: Considering that the chain drop pin is a lot more important than etched/stamped numbers, I would ignore that.
Q#1:The 22 ring probably wouldn't do any harm if you swap out the 26 for the 22. It is not bad, but the 22 ring might be heavier because it sounds like it was on a lower end crankset. If you need it, then use it and if you find that you never use it then take it off. As long as it works mechanically, it can't be bad. If you are used to certain spin rates then it might take a little getting used to.