As Mark says, the proof is in the printing and testing them.
Given simply their names, I get the hunch we've seen these papers under different manufacturer's names (Canson and Hahn) before but I'll await realworld testing.
Legacy Platine: 100 percent cotton fibre paper with a bright OBA-free, smooth satin finish. With a unique feel of an artistic paper of centuries past, along with an outstanding color gamut, this paper is exceptional for both color and black and white printmaking. (Canson Platine)
Legacy Fibre: 100 percent cotton fibre paper with an exceptionally bright OBA-free, smooth matte finish. With an outstanding black density, this paper is ideal for all types of high-end printmaking. (Canson Rag?)
Legacy Baryta: A baryta paper with a white, smooth satin finish, utilizing two barium sulfate coatings. Inspired by the F64 group, this paper takes the best of revered silver halide technology to new levels of quality. (Canson Baryta, IGFS, <N> other barytas)
Legacy Etching: 100 percent cotton fibre paper with a bright OBA-free, uniquely textured matte finish beloved by artists for centuries. This paper has the feel of traditional etching papers. (Hahn German Etching)