The rating systems are all over the place, as are the "jump" recommendations for skate models within many brands.
Jackson Elites are rating 80 (85 for suede, I think) and for "Doubles and Triples," but they were literally the stiffest boots I have ever worn in my life. They didn't even start to crease and I wore them for months skating tons of doubles in them. I ordered Elite Supremes first (didn't like fit), and the Elites were actually stiffer by a noticeable margin despite a lower stiffness rating.
My Custom SP-Teri KT-2 boots are much softer than the stock model I bought less than two years ago (would probably last 6 months if I was skating/jumping regularly and running programs - maybe). They're about as stiff as the Klingbeil S-1 boots I had (I am REALLY disappointed with them, considering the price tag). Compared side by side with the stock boots, the leather is visibly thinner. So, you design tweaks are another issue. You may reorder same model but the stiffness may be more or less even if the manufacturer advertises the same rating.
Risport RF2-Super was comparable to the stock S-2 Klingbeils I had. They probably had the most accurate "rating," and a lot of that had to do with the design. Uber comfortable, too (but high heels).
You really need to try them on in the shop to see. Sometimes boots feel fine when heat molding because they're warm, and then feel completely different when you're on the ice. It's also easier to bend them off the ice, as well.
Ratings are only comparable within brands. Recommendations are only guidance and no information is gives regarding the size/weight of skaters those recommendations are aimed at.
I am not sure it's possible to standardize since materials and designs actually vary to a large degree within and across brands.
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