Hi there! I am the sculptor for the new 1st Gear/W. Britains ACW line. I justed pulled Confederate firing set #17744 out to compare with the Old Ertle/W.Britain 'Lone Star' set and the Conte 'At the Fence' (2002) figures. The stature, and more importantly the arms and equipment are consistant. I will say that the paint and body proportions on the newer figures seems better. The 'Lone Star' set was sculpted in 1998 When I worked with Richard Walker at Ertle/W. Britain and to my eye the heads are a bit larger than they could have been. Perhaps 9 years and a few more sculpts under my belt have fine tuned things a bit.
With that said, I have all of these various sets displayed together, along with a few conversions swapping parts between figures made at different times and in different factories and they work very well together. A couple different threads on this site have rather large displays that include figures I have sculpted for Britains, ONWTC and Conte, along with FRONTLINE and in some cases even the painted plastic figures from Conte and they look pretty good.
There will be some great additions to the 1st Gear/W. Britains ACW series in the first half 2008 catalog that might be useful with your existing collection.
Hope this helps some, Ken Osen