I think it's very likely that the WiFi enabled Kobo will use almost identical firmware, there are 2 hardware differences, a more powerful processor and switching bluetooth or Wifi (at least their comparison makes it seem like WiFi has replaced Bluetooth). The processor may require differences in the firmware if it's a new processor instead of just a speed bump (a new processor may also still be compatible with the same software). With regards to the Bluetooth and WiFi modules it is a simple matter of only loading those modules if the hardware is available so the firmware could work exactly the same.
Anyway from a user interface perspective I would think there is a very very high probability the code would be shared so things like page jumping and more display options (margins) could easily be shared between the two devices.
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