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The difference is that the mk3 tdi came with 14" the mk4 tdi came with min 15". 14" won't fit on the mk4 due to brake clearance.

Also, the final drive on the mk4 is a little shorter, the VNT makes power earlier, and the mk4 has more power potential than the mk3 due to turbo, injection pump, etc. Each on it's own is minor but it adds up.

The mk4 also had the pumpe duse on later years, so those have more power potential. Yes the non pumpe mk4 have had more built cars, but the suggested sizes are appropriate for 99% of tdi drivers.
 
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