You only have to look at the Rossi and the Dynastar to see they are not identical. But they are made in the same factory and share a lot of ski characteristics.
My daughter has raced on Rossi in the previous three seasons, but have had a few Dynastar training pairs too, SL and GS (FIS HERO R21 and R21 WC FIS), and they have been identical in later years apart from top sheet up til at least 15/16. Don't know about the 17/18 versions.