Ok,

The 120 module uses a completely different accelerometer. It's an ST LIS2DH12, which has a different I2C address (0x19), and while it has similar registers to the MMA8652, they are not the same, or the same addresses either.

I will need to rewrite the library completely for the new modules (sigh).

The good news is that it is a much lower power device, and has a thermometer on board (so now you have two, or three if you count die temp).

The 120 module seems to be lower power overall, so battery life should be better than the 110 modules.

I need to check where my modules are, and see what is needed for the new library....