The N42 has a spray bar. They went to internally oiled with the N47. The P79 is internally oiled. If you block the spray bar holes on the cam towers all of the oil will flow through the P79 cam. So it's not a direct swap but it's not impossible.
Of course, as described in other threads, you'll need the rocker arms to go with the cam, matched to the lobes they were riding on. You'll need to send your rockers with the cam, also marked for lobe usage, so the the other side of the trade can make the MSA cam work. This is as I understand things (recently enlightened), to get the best odds of a successful cam swap. You may even need to have the rocker arms reground, to be safe.
#20 here has the basic summary - http://forums.hybridz.org/index.php/topic/105756-camshaft-question/