Hi.
By far the most common potentiometer shaft sizes are 6mm and 1/4".
You'll need a verniers caliper to tell them apart.
Then there's smooth and splined varities of those said sizes, but they're easy to tell apart

.
Edit:I'd guess that the Warmoth has CTS pots =1/4" and the Tokai has the "normal

" 6mm.
Regards
Sam