That's interesting...I used to have endorsement approvals for 402 and 404...and they were considered different types...in PNG at least...and in those days they just copied Aus.
To group 402 and 404 together is actually a bit silly...but then who would let you fly one only on the basis of the other...particularly 402->404. Very different engines...treat a 404 like a 402 and make very expensive noises.