MOH is by EA Games, whereas COD is by Activision.

Ah, so it's not a sequel. However, those are publishers, not developers. It's conceivable that the two games are made by the same team but published by different publishers. I'm trying to find out who actually made the games, and I'm having trouble locating names and details. So far, I've found that Michael Giacchino is the music composer for both titles, Vince Zampella is the producer of both titles, and I'm looking for more information.

Also check out Tron 2.0.

Oh yeah, I bought that one a couple months ago. Very decent game. Worth it just to see how well they pulled of the Tron universe in a computer game. A pretty decent FPS all the way through.