Noobish and kind of offtopic question.
1) i have seen almost every one is having ECU problem in these types of swaps.
2) mostly i have also heard that on the big diesel engines they are being swapped/used with other fuel pumps.
3) there is No certain guarantee of engine condition that it is better then the one being replaced.
But if one Imports engine from Japan these problems are not faced.
basic question here is that HOW much is the Price difference between Japan imported engine and local engine bought from bilal gunj/shobha/shershah is the Price doubled or even more.