Apologies if, I'm just confused by the wording:
But crankshafts in both Merlins in the DH Hornet rotated same direction. One engine has a 2 gear reduction gearbox, the other has a 3 gear, so propellers rotate in opposite directions.
P-38 Allison's crankshafts rotate in opposite directions thanks to some nifty arrangements. That allows both engines to use same 2 gear reduction gear box, sp propellers rotate in opposite directions.