Cams are different; the A12 cam only has one drive gear at the front of the cam which turns both the oil pump & distributor. The A14 has two gears, one at the front for the oil pump and one in the middle for the distributor.

The timing chain covers will swap just be aware that there are differences when it comes to timing marks. Two styles of covers, one has a single timing mark for TDC and then one has marks in increments of 5 degrees. There is a corresponding pulley, one with a single mark that goes with the cover that has multiple marks and the other pulley has multiple marks to go with the single mark cover.

I actually use the multi mark cover with the multi mark pulley so I can see up to 40 degrees of advance but this is for a race motor.........note you can screw yourself up if you are not careful.

Tom