Identical projects by students at two different colleges: still plagiarism?
The fact of being at different/same colleges or different/same universities has zero bearing on whether it is considered plagiarism or not.

If you submit a project that includes someone else's work, without making it clear what is your own work and what is not (and crediting the other contributor/s properly), this is plagiarism. This is true whether the other contributor is at the same college, same university, someone not in college at all, etc...