for anyone wondering....
Early Injectors: (White Top)
Ford Part Number: 3C3Z-9E527-AE
Fits 2002.5 - 2003 Ford Powerstroke 6.0L
International Part Numbers: 1843089C91, 1845879C91, 1843481C94, 1843481C95
Fits 2003 - 2004 International VT365 6.0L
Late Injectors: (Black Top)
Ford Part Number: 4C3Z-9E527-AA
Fits 2004 - 2006 Ford Powerstroke 6.0L
International Part Numbers: 1844751C2, 1846692C92
Fits 2004 - 2006 International VT365 6.0L and VT275 4.5L
3C3Z-9E527-AA (Original C91 injector) was replaced in 2003 with part number 3C3Z-9E527-ABRM (C94) and then later with 3C3Z-9E527-AE (C95).
These part numbers were for engines built before 9/22/03.
The latest injector number is 4C3Z-9E527-AA (C2 or C92) for engines built after 9/22/03.
The difference between original C94 & new C95 was internal change to clevis. Had to do with plunger suffering from side loading which then causes raw fuel to flood and enter the engine oil crankcase. Design improvements aimed at preventing scuffing.
There are no physical fitment differences between the injectors, but personally I would not intermingle them,
Along with the clevis re-design I mentioned above (which helps prevent scuffing) one additional change below:
Change in JANUARY 2004 from the 2003 design
LC (Diamond Like Carbon) Coated Plunger