Is the Raspberry Pi Pico pinout compatible with the Arduino Nano?
Here the pinout of Raspberry Pi Pico:
https://www.raspberrypi.org/documentation/pico/getting-started/static/15243f1ffd3b8ee646a1708bf4c0e866/Pico-R3-Pinout.svg
and here the one of Arduino Nano:
https://content.arduino.cc/assets/Pinout-NANO_latest.png
They are quite different and not compatible.