meb wrote:
I notice the diameters are proximate on Uniglide threaded cogs and track
cogs.

Are the diameters exact and treads the same such that they could be
interchangeable?

Not close enough. Your unigrind sprocket will come off with
a sasitfying ping if you are lucky and a darling curl of alumin-
iminuium if you are pretty.

NB: Yes, I have tried this*.

*Being pretty. Whoops, I mean a 14 Zhaenen UG sprocket
on a track hub.