Concerning the sound of the two, it’s very difficult to say.
Especially when I am no sound expert, but I try;
Both have a fairly strong sound, stronger then a minute repeater.
They have the same rhythm since it’s the same Cal 918 and both are in the same material, SS.
So basically they should have the same sound.
But I do think the sound of the AMI is a bit stronger and higher in tone then the MCM.
It might have something to do with the case- and crystal- shape/thickness.
Don’t know how much the holes in the back of the AMI helps…
Or it’s just my imagination, anyhow they are very similar!
Best
Blomman