OR ... look for those non-pre-drilled pickguards and match them up then transfer all the electronics from one guard to the new one. Maybe you can trade in the other "new" one at the store.
I recently bought a mighty-mite pre-wired pickguard, thinking that "all strat dimensions are the same". Boy was I wrong. Since the body was a ply-wood poS, I drilled new holes. It sure didn't look pretty.
If the holes are mis-aligned but will reach the original holes, I would NOT even try. You'd end up with ovalled holes.
You could also try the link up there (
pickguard paradise) and find out what your options are (for a price)...
Good luck!