Yes, they are the same expect for some plumbing and other tiny things, the engines are otherwise identical in early cars. Past 2004-2006 they went to the pumpe duese engine.
The 1998-2003 NB TDI engines are the same as the 1999.5-2003 Jetta/Golf engines.
The 2004-2006 NB/Golf TDI engines are the same as the 2004-2005 Jetta.
After 2005, the Golf and NB used the older engines and the Jetta got a new engine. The NB also got a dsg tranny one year too.
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