I wouldn't mix the 2 powders together but I've used the same load data for both.
The SC works better in powder measures and is all I use now
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Yes, they are interchangeable. In Hodgdon's own words in the front of their manual, "Ballistically, this Extreme Extruded powder is the exact copy of H4831. Physically, it has a shorter grain size, therefore, the designation SC or short cut."
And it does definitely flow better through a powder measure.
H4831sc takes up less space in the case than H4831. 60grs. of short cut fits
in my 270 a lot more comfortably than the H4831.Less compression.Each has it's place. I like them both.