How much do you value originality, or if you plan to sell, how much would buyers value it?
You already have the new rim laced up, it fits fine, and only the most eagle eyed afficianado of CB160's would know that it is a bit wider than stock.
If it doesn't bother you and doesn't impact value then I would leave it be and sell the other rim to someone that REALLY wants an original rim on their bike. Or, you know, keep it to use on the next CB160 you buy (and you know there will be another one) that has a rusty rim in need of repalcement.