^Exactly. The technology looks a little different, but no more different from the old than William Shatner looks from Chris Pine. And in-universe, they look exactly the same.
I like what happened to the Enterprise-A in William Shatner's novel The Ashes of Eden
. It was a fitting end for the ship.
As for the Excelsior, I was very disappointed in the STVI Excelsior bridge being the Enterprise-A one plus one unique graphic at the back and the TNG helm/ops consoles in front. The STIII partial set looked huge and hyper advanced in comparsion to me (even if it did use the ENT/TOS operating system, judging by those blinking coloured squares!)