I gotta think that by this point in your tranny rebuild,
you're the resident gearbox expert on SECCS.

If you don't know, or don't know how to find out, how are we gonna know!!?
My
guess is that if the ratios are the same, since the gearboxes haven't been fundamentally changed over the years, it'll work. But I do know there have been revisions to things like synchros over the years, so I can't say that I know at all for sure.