I've had some success mixing Bicorne command types in with Warlord and they look fine, if just a scattering for some added variety through a regiment. The Warlord rank & file don't mix well with their Bicorne counterparts though. I've not had a look at pikemen but I imagine it's the same.
I didn't know Bicorne & Renegade were by the same sculptor - I enjoy painting Bicorne, but currently doing some Renegade and just can't get on with them.
Warlord musketeers, and in the rear rank, third from right is a Bicorne command figure, so too is the slightly blurred chap, rear rank first right, carrying a short halberd crossways.