Thiel CS 1.2 Upgrade with SB Acoustic's

I have a pair of Thiel CS1.2's I got from a woman's garage, that were her ex husbands, and she did not want them. I first had to have one of the tweeters rebuilt, but after that I got to listen to them for about a year!  However, now one of the rubber surrounds on the speaker is coming loose and rattles when playing.  So after some research here is the plan.  I have a set of SB Acoustic SB17NRXC35-4 from leftovers of a car install.  Madisound recommended I get the SB17MFC35-4 as a replacement for the original Vifa cone.  So the plan is to test all three options

1. Compare the SB17NRXC35-4 with the original.
2. Compare the SB17MFC35-4 with the original.
3. Realize original is best and repair the original.

These are all 4Ohm speakers so none will change the impedance of the speaker.

I just ordered the MFC's so it will be a few days.