It's not going to look like a good idea even if they need the same version. You're not supposed to run homebrew as root; it runs as your own user instead. If two users try to install things with homebrew in the same directory, you're going to end up with some things owned by one user and some things owned by the other, and things will start failing pretty soon.

A while ago I floated the idea of having a separate, low-privilege "brew" user that installs things, with the brew command automatically switching to that user, but there was no interest.