OK, can't help with Carthiginians specifically, but Gripping Beast and Crusader Dark Ages (Picts, Saxons etc) match well.
Black Tree (if you're feeling brave / mad) are a good match too. Newline will match, IMO, but other opinions may vary.
Renegade Saxons are noticable wider than those from GB and Crusader, and have humungous hands (I mean like two-gallon buckets!), and (IMO, again), weird faces, like the one Ally Morrison used to sculpt for GW eleves back in the 1980's / 90's. Great on elves, but I'm less convinced on Saxons...
I think they do match GB / Crusader, but depending on your taste they might be a step too far. I'll try to get some piccies up on my blog soon showing the different figures side by side, for comparison.
Hope this helps,
M