Yes, they both use the same tweeter per se. But, the specific example you were referring to earlier was with the Sig towers from what I remember. I also recall you telling me that you were not too impressed with the Sig bookshelfs.
Sadly, Dennis had to deign (2) different X-overs for those Sig towers b/c of the drivers inconsistency. Not a good sign for sure. Just hoping that Fluance has addressed those issues. Very curious to see what Ziegl finds. Also hope that you check out the JBL 580's.
Cheers,
Phil