I am in the process of swapping engines in my daughters K12. The old one is out and I have been sold a replacement 1.2 unit. Only problem is when the engines are side by side they don't look quite the same when I look closely the head on the one I've taken out has BXO UKL2 stamped on it. The new one has BXO UKR4 -- Is this some kind of misc ID or have I been sold a 1.4 ??.