Arista Premium 100 was obtained from Kodak. but it was rated at 100.
likly from the Plus-x family, My evil guess is that Plus-X reversal movie film (normally only supplied in 16mm) was reformulated around that time, as the Bleach bath for that process was changed. the reversal film did have a data sheet note that the speed would be 100 (as movie film) if processed as a negative. this was at a time when Kodak was scrambling a bit and so might have been more inclined to salvage an otherwise unsalable master roll as private label film
the Premium 400 was apparently Tri-X although the possibility that it was also Tri-X reversal is a possibility.
the Fuji made films were called Legacy Pro and were equivalent to Acros in 100 ASA, and Neopan 400 Presto in 400 ASA. I had purchased some of both the Neopan 400 and the lagacy pro and the emusion numbers were in a simalar range. the Bulk Legacy Pro came on metal spools that were stamped "Fuji Film" on the side.
freestyle has always been good about differentiating the various private lable films to make it easy to batch them for processing. The EDU Ultra is Foma. The Arista II the next Generation was Agfapan. the regular EDU was Forte.