I'd also add that I think Mac software is far more capable
of running on various versions of the OS than Linux. Forward compatibility
seems to be the norm...I still have an app that I download back in the
10.1 days that hasn't been updated since, and it still runs fine on
10.6.4.
Usually the only limitations are when the software depends
on frameworks and capabilities introduced with a specific OS, and those tend to
be the major releases (e.g., 10.5 or 10.6, but not 10.6.3 or
10.6.4).
Yes, you definitely can.