No, the evo 7.5 is a 23 phantom running surface, with some mods to the chine, the 6.5 is a 7.5 with a plant in the mould.
The 23 phantom is typical of the ski/sportsboat line from phantom, having a chine beam of about 5' (at the transom) the 28 phantom is bigger all round, and has a chine beam at the transom of about 6' (7'1" overall).
Tornado's 9 metre rib is based on the 28 phantom, although they forgot to pay Steve Baker the royalties they agreed!
and damaged the moulds when they borrowed them to make their tooling.
Contrary to popular belief, a rib derived from a hard boat, at least this type of hard boat, is rarely any lighter than the original, as it's much harder to build strength into what is little more than an ironing board when seen without it's tubes, the hard boat version is a huge 'box' section in comparison, some extremely light and strong Phantom 21's (the boat I think the tohatsu/solent is based on) have been produced for very high performance applications, and I don't think it would be easy at all to produce this stiffness with the sectional size of a rib hull