[Username1]

Well, without a sub book, and numbers, you can compare the two side by side.
Make yourself a pinout map of both tubes as far as what you can see from the outside.
Be sure you can see the wires going to each element. Map it all out well, be sure the
key points to the same spots etc.

When I was in tv school me and another joker swapped picture tubes, delta's, one was
longer, and the screen curve on front was not the same. It worked, but we couldn't
put the back on without putting a extra bump on top of the original tube bump, good thing
it was a plastic cabinet, we melted it together with soldering irons.....

I think you should check out for compatible filaments too, volts and pins.

If you guys didn't get to do this stuff in high school, well, you missed out big time.... Lots-a-fun!