will an 06 injector pump work on an 03? they look like they are the same.

 

Yes, the CP3 pumps interchange, however the 06 is significantly upgraded from the 03. The injectors and control units will not interchange.

Do not go the other way from an 03 to an 06, unless the 03 pump has been completely rebuilt to current standards with all the upgrades, or you will destroy your injectors from the crap they shed as the older pumps wear the non-upgraded components.