I've had a couple of people ask if you can mix the two sets. To which the reply is that you *could*. Probably. But why ? Just buy more Perry models, they're much nicer.
Your pictures speak a thousand words.
The Perry set also has roughly twice as many components - in terms of different bodies, arms, heads, weapons, etc.
But fair play to WA, they stole a march on this one. First mover advantage and all that.
Perry and Victrix, for me, are streets ahead of anyone else in the ‘historical’ plastics stakes, for both quality and quantity of components.