Replying to Mounting FKS Toepiece with Pivot Heel Piece

So I have a pair of FKS 140 bindings with the old pivot 18 toe piece construction. However the heel pieces that come with them are the wrong brake size for the skis I want to mount them on. I just bought a pair of brand new pivot 14s for 250$ with the correct break size. My question is:
Can I get a ski shop to mount my skis true center with the fks 140 toe piece and the heel pieces from my brand new pivots?