i'm guessing that the spanish K10's may have a varied loom, some foreign cars do, eg foreign rovers have a slightly different loom to the uk ones.
If it'll help, i'm pulling all my headunit wiring out AGAIN sometime tomorrow hopefully, i can tell you what the wires are on mine for the power (i don't use the stock speakers).
You doing anything bigger with your ICE, eg new speakers and sub or anything?