the capsule is most important for the sound, yet different electronics in a mic can make a difference, too. that said, the cmv563 with m7 capsule basically resembles the um57, which is identical in circuit design (except for that it's pattern switchable), but there should be a small sonic difference in the upper mids due to the different head grille. microtech gefell recently re-issued the um57 as um75, plus, they've had the um92.1 and m92.1 in their regular range for a while, all with the same capsule and head grille arrangement, and basically with the same circuit, except for different tube and a few minor changes.

i doubt that u47 and m147/149 will sound really similar (sorry david ;-), since the u47 has a very special circuit involving a tube considerably operated out of specs (underheating, low plate voltage) and thus - as is frequently mentioned by many - yielding a very special distortion behaviour which obviously is unique to the mic. the m147/49 have an entirely different circuit topology; instead of an output transformer, the signal passes through a solid state output stage. the resulting very low source impedance differs from the standard 200 ohms of older mic's. the resulting different relation to the input impedance of the following pre-amp can also make a sonic difference.

hope this helps more than it confuses ;-)