Are shutters all a standard depth?
As mentioned by Dan all modern shutters are equivalent with same threads and same inter-cell spacing, single difference is that the
shutter-board flange to
cell-shutter flanges distance may vary by around 1mm, so one may hold the lens 1mm farther from film than the other, the obvious effect is that with some shutter you may have to give 1mm more or less bellows to focus the same.
With 4x5" short focals there are two usual strategies, having a 65mm and a 90mm, or replacing both by a 75mm. For some landscapes you may want to go wider than 90, but this is totally about taste, and starting with a 90mm is great.
I have the Fujinons 65 and 90 multicoated, old excellent glass. Older Fujinons were sold with Seiko shutters, newer have Copal. Seikos are very good, but good service was more difficult to obtain since time ago, also they are more complex.
IMO most critical factor is shutter, if your lens comes with a shutter that is in shape this would be nice, now we face a situation where most of the shuters are pretty old and many have not been serviced recently or never have been serviced. Having a (cheap) shutter tester is always a good idea.