In the last post's comments, Jon asks for a comparison between Fife & Drum and Perry. Here are some Fife & Drum figures next to all the AWI manufacturers I have. All these figures are based on identical Litko bases. From left to right we have Old Glory first edition, Fife & Drum, Old Glory second edition, Fife & Drum, and Perry.
I hope that picture convinces you, as it does me, that the ranges are all broadly compatible. I would not mix Fife & Drum with other ranges within units, but they should not look out of place on the same table.
Old Glory first edition, Fife & Drum
Old Glory second edition, Fife & Drum
Fife & Drum, Perry