Not sure exactly how close the 2 layouts are but the 422 is the CC version of the 424. The 424 had issues with oil
canning and some cracking on the hull
in the forward sections, there were some fixes that looked after that. The transom was on the thin side so if you were going to mount a vane you would want to beef that area up. The V-berth is very tight for anyone 6 ft and up.
The 422 was built in small numbers and is quite popular. The 424 was built in different variations and seems to be an OK offshore
boat if well looked after. Either one should make a good live a board as they are quite large compared to many other designs in those years.