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IMHO no, an immunity to certain poison isn't really generalized immunity, , especially as poisons can be based on totally distinct principles: i.e. enzyme based, inorganic chemical based, radiation based. Maybe I could justify giving Gripplis an immunity or resistance to one specific kind of poison, but not everything in general, which is what "poison resistance" implies. In balance terms, I think this is like Elves having special immunity one certain type of paralsysis inflicted by Ghouls, not all paralysis, or not all necromancy etc. Mostly I wouldn't bother unless it was somehow important to explaining something I wanted to do with setting, i.e. Gripplis using poison that didn't work on each other. Just as ungrounded speculation it doesn't seem to add much to game.