That is belief in constancy only of form. There is constancy of concept as well. Is your copy of `cat` different because it is composed of different electrons even if `diff` would report no difference? It is still an old program.

What is old? These companies have differing memberships, different corporate structures, and make different things. Yet we call them the same company.

Constancy need not be only of form. It can also be of concept.