Elite repair: +13 rep, +9 other.
Elite engineer: +13 eng, +9 other.
The former two add up to +22 rep per level.
Regular repair: +11/12 rep, +10/+9 other stuff.
Regular engineer: +11/12 eng, +10/9 other stuff.
If you have a +12 repairer and a +12 engineer with +10 rep you still get +22 rep per level.
If your +12 engineer has a better repair rate, say +11, you get more rep per level than with premium sailors.