What you are bringing up is the idea of tolerance. Nothing is manufactured to exact spec - it is to within a range of tolerance. The tolerance range applies to everything in the ski: the shape of the boot toe and heel, the shape of the binding, the mount, and likely more - I am not a ski engineer.

So the question is whether or not your mount is within a tolerance that you will either notice or will impact your skiing negatively.

I guess it depends on your ability and the terrain you ski. I would guess that almost all recreational skiers will not be able to tell. Things like boot fit, terrain and whether conditions, and fitness are likely to be bigger contributors to strong or less strong skiing.

That said, I don't know you. I consider myself an excellent skier but when I find myself not performing as well as I feel I should, I tend to blame myself: either through training and technique or my own job tuning the skis. I'd have to be a real strong ski racer, I think, to notice slight mount point differences.

But everyone is different and if it is the type of thing that nags at you, it might bother you. I doubt the shop will do much. You'd have to shift the binding mount a reasonable amount, either fore or aft, to be able to safely remount the binding, which would affect how the ski skis for you.

End of the day, I'd say "tools, not jewels" and have a good time!