I would leave it be as the difference is negligible. And your playfield looks to be a very nice example.

But if you can't stand to leave it then do as you mentioned and drill pilot holes (smaller diameter then screw) before screwing into new position. Also be ready for some paint chipping/crazing. It might be wise to put a piece of painters tape down around the drill location to secure the area while drilling. If you use the yellow (thinner) frog tape you should be able to see your mark on the playfield. And as already mentioned by Billc479 be aware of possible touchups.