It's also dependent on how willing the country is for the ship to survive combat. The classic combatant includes a lot of recoverability/survivability requirements that include things like shock resistance, compartmentalization, reconfiguarbility etc that significantly exceed SOLAS (which also drives larger crews for the DC side).
Some countries have OPVs built to commercial standards with none of those recoverability standards apply, and basically accept that they are likely to lose the ship if it sustains significant damage, so they just try and make it safe enough for people to evacuate in a damaged scenario, and beef up some countermeasures to try and avoid damage to start with. But with some of the warheads or heavy weight torpedos, it's somewhat academic regardless as they are big enough to render any corvette size ship into shavings and have a big enough shock wave to pulp the crew, even if it's not a direct hit.