This is a basic geometry problem I could answer exactly for you if I had a chance to spend about 5 minutes working out the equations on a piece of paper.

My equation will assume that the piston crown has not been modified by the piston manufacturer to make up for the extra cylinder volume

If not the easy answer is that it will cause a slight increase in compression.

Unfortunately I am too busy at the moment trying to get work done and catch up on TR posts, but if no one gets around to it by later tonight I will let ya know.