generally people tell you not to put more than 3 sets of holes in your skis or else the structural integrity is compromised. sounds like you're in the clear.
even if you use youre old boots, the bindings will need to be adjusted and probably remounted. you should be alright though, it usually starts getting risky if you try to mount more than 3 times.
The ski shop will do it three times, I was told. Afaik they'll do it after, but they'll more than likely waive any kind of liability after three times.