It's not just the ships they changed, it's the lighting. I think new shot matches better and is far superior.
Wasn't the original mission statement to keep things as close as possible to the original presentation with the exception of fixing obvious flaws (like wrong phaser beams)?
I still can't see what was "obviously" wrong with the original opening shot.
And if they changed that, why did they recreate the 4-footer in CGI and not use the CGI 6-footer they already had, instead. Well, you get the idea...