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Does any one know how small the Pike and Shotte models are relative to Gw Empire Spearmen and Handgunners?

if you are talking about the Warlord Miniatures, I can give an idea.

I have some of their Celts, and I have seen the Romans in person, and they are sized pretty close with GW.

I can't say if you can mixnmatch, but they would not look out of place. They seem more true scale in regards to proportions than GW (hands and weapons)