EC have always had Euro pricing and USD pricing for the longest time it was cheaper to buy in Europe , with the sagging dollar the pendulum has swung the other way. If you want to fly under N reg in UK you may be OK to buy in USA and fly in Uk ( or other Easa country ) . If you want to transfer to UK register you may find EC less than co operative. But if the diff is 2 mill for sure is is worth looking into. Plus of course the ones for the US market will have reverse main rotor direction