The foot figures are from the left:
Old Foundry, Gringos 40, Newer Foundry Copplestone OW not Camerone, Gringos 40, Copplestone Foundry OW as before, then Gringos 40.
Mounted figure Copplestone OW, not Camerone sculpts. then Gringos 40.
The original Foundry Maximillian range is practically 25mm, the sculpts are very old, and not compatible with much these days. The Copplestone later additions which were listed under the newer OW range are bigger but again are noticeably smaller than the Gringos sculpts.