Is it possible to swap the internals of the D16A8 into a D16A9
 

1991 rover 216 gti blown a rod engine code d16a9 - can i (my garage lol) use the block and rods pistons etc from a d16a8 engine to rebuild the d16a9? What is actually different between the two apart from the fact that the a8 has a cat converter? d16a9 seems to be much harder to find than a8. what should i do? thx