There is no engine brake! This is a cold start device and can be left off in all but the coldest parts of NZ and even then its not that usefull.
If they are both either electronic or non electronic engines you can get away with changing nothing from the engine side but if they not both the same trans there are some extra sensors to worry about.
Have a good look at both engines before you start and if all makes sence go for it.
good luck