From looking at a few of the pictures of the L10 from the rear, the L10 external power supply appears to have 2 outputs and the L10 has two power inputs and doesn't appear to have an IEC inlet unlike the L1 which requires its own power cord in addition to the X1. So, assuming this is correct, all of the power to the L10 comes from the outboard power supply. I can't tell if the outboard power supply has just a single transformer or if there is a second, smaller transformer inside of it. I would also guess there have been some parts and layout improvements inside the new power supply.
And the M10 requires 3 power cords instead of 2 that the M1.1 uses.