[nitrous9200]

The CF03 and DC22 are two different updates; CF03 was the original update released last year and DC22 is the second update after CF03. Basically, they are like Windows service packs, XP has 3 of them, starting with SP1, then SP2 and finally SP3.
You don't have to update to DC22 but I would just for the sake of being up to date. It is not necessary to have CF03 to run the Yardi4life ROM either, I updated to DC22 and installed that ROM and it worked.