I re-keyed my glove box along with the rest of the locks on the car. However, my 77 uses the newer (74 on) style lock. I haven't messed with an older style glove box lock. Mine looks like this:
While the older style looks like this. I've not messed with one of these, but I expect it to be conceptually similar to the rest of the locks:
So about the tumblers for the ignition locks... I believe the only difference between the tumblers for the ignition and the rest of the car is a slight change in profile at the top of the tumblers.
Here's a pic of a couple ignition tumblers. Note the concave shape to the top of the outline. The doors, etc do not have that concave feature:
Everywhere else on the car, the tumblers are domed (convex) on both top and bottom. With that in mind, ignition tumblers are able to be used in other locks, but I don't remember what that concave feature is for, so I can't offhand tell you if door tumblers would work properly in an ignition application. I'll have to dig my (three) lock box off the shelf and re-familiarize myself with that detail.