There's actually no single generic rule for "international ops". Each country specifies the appropriate use for "Mora /Moca(t) /LSALT / MSA /" etc. in their own AIP. This may, or may not, completely conform to ICAO specifications.
I'd have thought that it would be usual for companies to spell out the differences in their Route Guide data, so that pilots have all the relevant information immediately available to them.