The Mühle R41 has indeed the same head as the Merkur 3-piece OC razors like the 25C and 25C. For fit and finish the Mühle is unbeatable; way better than the Merkurs.
The main difference between all the Merkur razors (and the Mühle) is about balance and length and diameter of the handle as well as total weight. Some prefer their razors to be a little head-heavy with a not too short handle like me and the Mühle would be the best choice if that is the case with you. The Merkur barberpole would be the heaviest one you could get. The Mühle configuration gives me more control over the shave but YMMV; it would be my first choice no doubt.
I must to the barber's, monsieur, for methinks I am marvellous hairy about the face