Is there any real difference?

Is there any real differences between the M-240 and the M2120 amps. I currently have two of the M-240 amps and one M2120 amp. I'm considering buying anouther M2120 to have a matched set of those instead of combining the two models. Any ideas?

just a bit, the inside board was just a bit different, and the M-240 used a glass fuse, the m2120 an ATC type. some of the early M-240 used a different value for the bi-amp crossover point. both great amps, my faves.

Is there any real differences between the M-240 and the M2120 amps. I currently have two of the M-240 amps and one M2120 amp. I'm considering buying anouther M2120 to have a matched set of those instead of combining the two models. Any ideas?