I really am not sure if they would interchange, I have a few examples of both but have never tried to swap forearms. To remove the forearm the magazine tube must be taken out & on the 1914's, because it's pinned to the receiver, that is an involved process. I will try to do more comparison in the next few days & post an update. Of course we are not talking about the later Model 25 forearms with two mounting screws only on the right.