Yep, that's right, Cap - Bob did the Soldiers and Cultists. Glad you like the heads - I'll want to see some Wildlings in due course!

Despite the different sculptor, the Barbarians and other humans will be fully compatible in terms of components. The Gnolls, naturally, are a little trickier to mix and match, being monstrous animal hybrids and all - the head/neck joints are different, but I reckon the arms would be largely compatible.