I only have OG Austrian artillery crew, but every Eureka figure. Size wise OG are about 1.5-2mm shorter than Eureka but are basically the same build/heft. The height difference is completely in the stubby legs of the OG figures. A thicker base and they can be masked to stand together if the height difference bothers you excessively. I don't know how consistent OG are within their own range, but Eureka are pretty much all exactly the same height.