I thought I would take a closer look at the French Carabinier figure recently purchased off Ebay. He sits in the pose used by all of the Ros 25mm figures that I have seen, upright with his sword resting upon his right shoulder. He wears the typical Ros enlarged helmet, in a similar style to the lancer figure.
As can be seen from the picture the French heavy cavalry horse is of a different pose to those used on the Prussian and British cavalry, and indeed the French Lancer. I suspect that this was the first moulding used and was later revised for subsequent figures. A shot of the base gives the code number H1 and the date 1975.
When I get the time I will paint him to see how he turns out.