I am separately posting photos I just took of the M-32C; but now that I have also disassembled it, here are a couple of comparisons:
A-34C is baffled; M-32C is not. What difference this makes is not clear to me, but I haven’t made close comparisons and might not detect differences that are there in any case. They sound about the same to me.
Metal tray weights: A-34C 122 grams; M-32C 208 grams.