hello ya'll

i'm thinking about up grading my 04 zx6rr for a 05 636, i found one for a bargain price but its missing the ignition lock set. i found a few lock set for sale on Ebay US, but need to know weather i need to change the Aus spec ECU too, cos i think they have the immobilizer ECU, so i just need to know if i buy the lock set and ECU for the US spec 05 636, replace it with the ones on there now would the bike work?

thanks in advance for any advice.