Not interchangeable if you have a fully framed shower & door. Every manufacturer is different.

Some people have changed the color of the frame of their shower doors with paint (special paint - not sure if there would be one that has a nickel look to it - but I have seen different mettalic options). Would cost less money if there is a metallic paint that looks like nickel.

Or - you'll need to replace the entire unit with a new one as commented above by millworkman.