The MOC process is parallel to, but independent of, the SA process. And, as noted above, each MOC can run his/her process differently than other MOCs. Thus, each MOC can look at more . . . or less . . . than each SA and more or less than another MOC. Some may require additional/different essays, some may ask for different/additional LORs, some look at different/additional test scores, etc. Some do interviews and some base their decisions solely on the paperwork you submit.
Each MOC's requirements are either posted on line or are available from the MOC's SA coordinator.