If the front face goes from 375 mm to 400 mm, do you really think that the crossover for the tweeter and the medium should be modified (not for bass)?
The effect will be minor.
You can see it for yourself with Basta! Tools, Baffle Designer.
Run it in Windows 8 compatibility mode and use the serial number D4E5-EEA9-A5CE-8BD0 to get it started.
Get the 6RS140 Basta! T/S file from loudspeakerdatabase
You can see it for yourself with Basta! Tools, Baffle Designer.
Run it in Windows 8 compatibility mode and use the serial number D4E5-EEA9-A5CE-8BD0 to get it started.
Get the 6RS140 Basta! T/S file from loudspeakerdatabase