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Incidentally the small Retiarius in the last pic is a 28mm for size comparison.
I don't think that is a Foundry figure. Crusader or Black Crab maybe?
I guess it depends on your preferences for differences in figure sizes. I think the equipment packs would work fine on 32mm figures. For what it is worth here is a GB 35mm and Crusader 28mm comparison shots:
Probably look fine on the Kai-whatever guys, as they are pretty big themselves.
CP-Models have a pack of gladiator heads if this helps.