2009 EE20 replacements?

[Damokc]

Hi all. 

So I've bought an Impreza tdrs with an engine kaput. I've read of a guy putting a 2014(euro5 or Euro 6?)Forester engine in it. Well basically the block and internals and keeping the euro4 connections, ecu, plumbing, injectors etc. And it ran first turn of the key. Does anyone have experience of this? I picked up the car very very cheap. Guy was gonna scrap it.

Thanks in advance for any help.