Yes. Generally speaking ISOM is any Havana Puro.

It doesn't include European Cigars that have ISOM tobacco in its blend. I believe the European version of Villager (sp) a dry-cured cigar contains a blend which includes ISOM tobacco. I know old villager 5 packs sold at one of my local shops said "contained cuban tobacco" which was blacked out with what appeared to be a sharpe.

Nor does it include the ISOM brand that I think JR sells.