Mini's that match AB 20mm Miniatures Range?

[Atheling]

Hi,

I've got what I hope will turn out to be a pretty straight forward question. We've been playing a lot of CWC using 20mm mini's and I have my beady eyes on AB mini's.

I was wondering, what would be the closest match for AB in terms of size and bulk if I went down the route of buying?

Thanks,
Darrell.