My sets arrived this afternoon and they match the size of the Barzso/LOD Grenadiers and Militia, based on a comparison of common poses such as marching, standing firing and kneeling firing.
The Americans in each set are all dressed and equipped the same.
The standing and selling firing British poses are wearing short coats and shoulder wings. These two poses have badges on their cartridge pouches and do not have packs. The other British infantrymen have packs, long coats, no badge on the pouch or wings. So the poses seem to be a compromise between Light and Center companies.