I loved the Corwin series, and I really liked the Merlin series, but the two protagonists operated on very different levels, Corwin never delved into the meta-physics of the universe he operated in, even if he created his own pattern and reality. He always treated the Pattern as a tool. Whereas I got the impression Merlin was taught about the true Pattern and the details of what his ancestor Dworkin did. He also started talking to it, when he started to see that it was taking actions in its own behalf. He treated the pattern as an animate entity, like his Ghostwheel.
The series were two very different takes viewing the same world, from two individuals with wildly different backgrounds. One is the pinnacle of Machevelian scheming, the other has deeper insight and powerful abilities.  if we swap the characters, Corwin would have suspected and acted against Dara and the others in the Courts outright, he would not have trusted them completely as Merlin did in the beginning, and Merlin would have gone to the primal pattern immediately, found the problem and devised a technical solution to correct it. These would have been much poorer stories 
