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dont know for sure but you will need a new and correct transponder for the key. you can get them from here:
http://www.hickleys.com/diagnostics/keys_list.php?manu=40
AFAIK the 433/434 is only rounding anyway and the difference doesn't matter. I never bothered checking, so it could be just luck mine worked I suppose, but I was under the impression it didn't matter.
Would think a Golf of a similar year (2002) would be the same and on my old key, the part number is "HLO 1J0 959 753 AG" and frequency is 434MHz.