valve
I just did one where the customer ordered new Moen trim for the shower. They sent him trim for the new version, but he needed trim for a Moentrol, and it did not fit. If parts for the same manufacturer will not interchange, what makes you think that parts for different manufacturers would be compatible. And why would a manufacturer want to make something that you could change to a different company later? Find Delta trim that is close to what she wants or redo the shower valve. And when it comes to Delta trim you also have to know the version because it is also not interchangable with all bodies.