efred,
While Blue Moon are certainly larger than most 15 mm ranges, except for Irregular generally and maybe Lancashire, you do have to take it range by range. I have Pirate, Wild West, Africa, French India War, TWI figures from them and with the sole exception of the African native figures (much bigger than most of that range), none of them scale out close to any of the plastics I have in 1/72. And HO is really too big for matching though I know some people use them. I use the HO animals but only because some items I want cannot yet be found in 15 mm.
You have a lovely comparison photo but you did use a figure from one of Blue Moon's largest offerings that I am familiar with so that should be taken into account. Even so, to my eye, you can use all of those figures on the same table if not in the same unit.