The Cape Wars and their associated ranges have quite a few campaign modifications to uniforms and kit, which are relatively distinctive, albeit the Perry range has quite a few sets in basic shells and forage caps that could be used elsewhere. Peaked forage caps on ORs,wideawake hats, stocking caps, locally made belly boxes and tunics shorn of lace are however, pretty much a Cape War thing.
The 1st Maori War range is a bit more versatile, being essentially an 1830s/40s undress uniform, so you could arguably extend their use to say Gwalior, China (1st Opium War), Afghanistan and painted as Marines, the 1840 Syria Conflict plus a few more no doubt. Naturally you could add variety with the Perry figures in the same kit.
As per usual you can of course choose to use your toys however you see fit.