WordNet sense 1 (brought into conformity with a standard):

standardized

WordNet sense 2 (conforming to or constituting a standard of measurement or value; or of the usual or regularized or accepted kind):

standard

WordNet sense 3 (capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability):

exchangeable, interchangeable, similar

WordNet sense 4 (capable of being replaced):

replaceable