I don't see the mix up. Hodgdon's Clays line has 3 powders:
Clays
International Clays = International
Universal Clays = Universal
I might have missed the post that mixed them up but I don't think there was one. (but I could be wrong)
The post about pressure spiking was in reference to clays.
Universal Clays is pretty tame. It is a good mid-range MODERN propellant. A much better choice than Unique IMO.