I wouldn't expect anything different with the Diamond as far as weights (140-159). It's part of Lat's "Easy to Use" line which is all 150-class. Can't imagine that formula changes with Frost since it didn't change with Opto vs Gold.
I have a Frost Claymore. I've been able to do some side by sides with the Opto Claymore. My experience has been that the Frost has a bit more HSS. Where the Opto will go out from a slight hyzer release, turn up flat and turn just a bit before fading back, the Frost seems to go no further than flat and straight before fading. They both tended to fly about the same distance with these slightly different lines, with the Frost finishing a few feet further right (LHBH).
I love the feel of the Frost too. I've only been able to throw it in cold conditions (25-40 degrees) so far and the grip is great even when other discs start to get harder and slicker. I'd put it between the Zero soft and medium in terms of give under my thumb but obviously with the durability and solid feel of Opto. Can't wait for it and its DD/WS counterparts in the molds I throw more regularly.