4.1 - 4.2 different product id

hey guys,
i want to buy jjs os. i just installed the new os 4.2 and the product id differs from the one on os 4.1. is this a problem after i bought and unlocked it?
i'm sure it isn't but i just want to make sure i don't have to pay for every new update...

unlock the one that you sent to him...... then upgrade to 4.2 man...... you dont have to pay for them