Outer Limits 4x4 Board

Iam just curious as to weather the head from a j20 will fit on the j24 block
i realise that they may be a bit new for anyone to have much knowledge on but worth a shot.
Seeing as though i dont think anyone will be transplanting the whole 2.4 due to ecu issues
i thought that if heads were interchangeable then the early model head and accessories could be retained.