A couple of months back I had the engine in my 04 Disco (w/ SAI) rebuilt. Over the past couple weeks I've noticed that I am leaking coolant and my mechanic has looked it over a couple times and unable to locate the problem. He thinks that there may be a small crack in one of the cylinders. He has offered to swap out that engine with a re-built engine from a 2002 Range Rover 4.6 for no cost. I'm not sure if I should push him on an alternative solution b/c I have a one year warranty or go with the switch.

From my initial research, they appear to be the same engine--is that correct? Any other questions that I should ask before allowing him to move forward.

 

They are the same engine.