Hi, Im thinking of putting a Seymour Duncan Invader in the bridge of my EVH Wolfgang standard. Just wondered, will it be ok to keep the stock pickup in the neck or should i buy a set???
I can only answer that with a question. Do you like the existing neck pickup? That answers your question...

yes...keep it.

No...replace it.
Hmmm...I wonder what this button does...
From a wiring standpoint, both are passive pickups, so it's OK to have different brand pickups if that's what your asking.
Cool, thats all i needed to know. The neck PU sounds good, just want something with a bit more balls at the bridge 👍👍