Vendors sometimes quote total THC on the pack and delta nine on the lab sheet, or the other way round, making two identical strains look different in strength. Total THC includes converted THCA and is always the larger number. A short guide on
https://potentthcseeds.com shows which figure each breeder tends to quote in listings, so comparisons are made on the same basis. Once you check the fine print, a lot of apparent potency gaps between strains simply disappear.