You only have to desolder one of the two leads on the "dead" tweeter to take it out of circuit for testing purposes. Testing in-circuit like you did, really means nothing. Just disconnect one lead from the potentially damaged tweeter and re-test.
As for the woofer issue, my OCD would prevent me from every being satisfied until they were both the same, even if they sound/perform the same as-is. I have quite a stable of JBLs with the white cone woofers, but in later years, the re-cone kits for those woofers (from JBL) were black cones--and I just can't live with that, so I hunt and pay the price for used "originals"--but that is just me.