People are all different sizes so you can get away with a fair amount of size difference with figures. That said I had to shoe horn the Millicast 1/76 figures into my 1/72nd jeep
I am almost ready to paint a SAS jeep from NW Europe and the figures I have, again are from millicast. This time they are a bit smaller but should be fine and not look out of place at all.
The figures I have had from Millicast are ace. A couple of the old sets are not as great but all the newer stuff is top class, plently of heads as well to convert other figures in the new sets as well.
Prieser + spare millicast head