Ah... you are right, I did miss that important little detail.
Even so, the difference between a used VW TDI engine and a used Honda engine is fairly huge... the cost gap would not be narrowed by much! Used Honda engines are going for about $300 (in my area) whereas used TDI engines run around $1500. Heck, you could replace your dead Honda engine with another Honda engine and still have enough money left over to drive another year & a half before spending the same money it would take to just buy the VW TDI engine (without any fabbing of engine mounts &tc).