Re: Predator 670cc V Twin bike
No. I'm not 100% sure, but it's probably the same engine block with just a different piston and cylinder, and/or maybe a different crank.
If you can get the newer one, it would probably be a good idea. Not because it's newer but because it's always good to have a spare engine. Especially if he says it's a working engine.
But even then I would check the compression of the engine that is in the bike, and get it running first if there are no major problems. Just because it's already in the bike.