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Do you have the facelifted Phase II 2005 Laguna? or the "older" Phase 1 Laguna II?
Also I believe that later Lagunas have multiplex wiring ( although the jury is still out on that one), so the 2003 lights may be from a non-multiplex wired car, so plugs/connections may be different.
Assuming the lights are the correct ones for your model then it does sound as though the wiring is slightly different. If you have access to a Haynes manual you may get the info you need from the wiring digrams in there, otherwise you will probably have to speak to an auto electrician.
Currently in SportTourer's garage:
2010 Laguna III SportTourer Initiale Tom Tom.