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AFAIK, the two kits are inter-changeable.
You could use them as sergeants, which would help them to stand out, but IMHO they look badass as a unit.
You could also try something like this:
http://z15.invisionfree.com/The_Great_Crusade/index.php?showtopic=215
to add some more knight-ness.

Aquaterry