Follow up question on new install

After installing successfully the purchased 600/700 update to the 800/900 pkg, I downloaded the service packs. First,  PMDG_737_800_900_Model_update. This was created in 2004 so I'm thinking I don't need this on my 800/900 installation which I just purchased in a CD last week?. Then there's PMDG_737_8900_NGX_3219_SP1c. This was created in 2012 and carries the same rev # v1.00.3219 as my CD, so I guess I don't need this either? Finally, there's PMDG_737_6700_NGX_3219_SP1c. This also bears a 2004 date so again I'm thinking that the 600/700 augmentation package I bought today would be inclusive of this as well. I've researched this in the forum and the PMDG site with no clarification. I'd appreciate your thoughts and guidance. I don't want to install stuff on top of what I have unless I'm sure I need it.

Thanks again