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Micro and Nano do not use same chip. But still it should be workable. Pinout needs to be checked and the board must be choosen correct?I can't see any big differences between the Nano and Uno in I/O that would account for non operation. I would take a guess you have a ground not connected between the Nano and your stepper motor drivers. But I'm guessing without seeing your wiring diagram.
The first thing I came across, the I2C pins on Micro are SDA-02 | SCL-03 on Nano they are SDA-A4 | SCL-A5. (so display needs to be wired to different pin numbers already) And programm needs to be changed accordingly.
Hope you will figure it out soon.
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