Florent, you are referring to 95, 98 and 100 RON octane.

In the USA, they don't use RON. They use AKI and CLC. Maybe also MON. But AFAIK, they don't use RON in the USA.

90 AKI = 90 CLC = 95 RON
93 AKI = 93 CLC = 98 RON

Different units used in different parts of the world...