There will probably be no difference in the development in the negative stage, that is a purely 'mechanical' process involving times temperaturs and the quality of the chemicals (there is a good bit of latitude there anyway, Where it will and can go wrong is when they are printed. Unless the machines are properly calibrated that you are going to get all sorts of problems. It may be the operator knows his stuff and any printing you have done will be ok, but if he doesn't - well you take your chance.