in terms of using the MCU surface config that comes with reaper, they work the same. The EXT does not have the additional functions of the MCU such as transport and added buttons, jog wheel, etc....but the channel controls will work the same. You could (and should) use the same MCU config option for both MCU and ext (or whatever controller you're using, I'm using the Icon ProX and XS, same thing) and not the mcuEXT config option. I'm not sure why the EXT config doesn't work well, but you can just use the MCU, and apply the appropriate channel offset.
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