The 2003 and 2004 clusters are fully interchangeable. 2005-2008 have an extra connector
2003 had red lights behind the gauge faces. 2004's have white lights. This makes it easier on the 2004 clusters to come up with custom colors by creating new gauge faces, without having to change out soldered in lights.
in the 2003 and 2004 model years, there were eight cluster variants The US models have english units, the Canadian have metric. The base ones have lower tach redline than the GT
2003 base US
2003 base CAN
2003 GT US
2003 GT CAN
2004 base US
2004 base CAN
2004 GT US
2004 GT CAN
(so, if you decide to get a 2004 cluster, make sure you get one with the right units and tach redline)
If you can find a computer that still has a parallel port interface, you can adjust the odometer readings without too much trouble ->
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I replaced my 03 cluster with an 04 cluster (wow, that was 7 years ago) Here's what the two look like, shown base US models, 2004 on top, 03 on bottom