Bad X seat mod

I am considering the memory foam seat mod on a 1300S. For anyone who has had this mod done, does the passenger seat meet up as easily with the driver seat after the mod is done? I have a driver backrest attached to the passenger seat and any height change to the back part of the driver seat may cause problems. I want to avoid having a nice seat mod done, but then have to remove the driver backrest because it doesn't fit due to a shape change of the driver seat.

Thanks much.