98 was the first year for tdi's in the golfs.
There aren't any OEM A3 IZ/AHU Golf TDI's in North America.
Well, actually, there were rumours of a few ie<10, but even if true, good luck ever finding/seeing one.
A3 Golfs are AAZ IDI.
A4 Golfs (99.5 & newer) got ALH TDI's.
The beetle got the A4 ALH engine in 98, a year sooner than the Golf & Jetta because it used the A4 platform right from inception.