how to change euro focus headlights from 00's to 02's?

Have anyone in here did this?
I know that if you change headlights, then you must change front bumper, and do a litle wiring.
So, what's the diference between 98-01 and 02-05 wiring? Will just a simple brazing help? Or something more should be done like condensators, voltage changers ant other stuff?
Very thankfull :) sorry for english
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