Identical CP210X USB-Serial converter conflict?
Can identically configured USB-Serial chips ever have conflict?


Nope, the OS can usually handle these conflicts.

However, the user/application may not: E.g. on windows you won't know which COM port will be assigned to which device, as this is normally tied to the serial number string. Linux ttyUSBx works a bit different though.


  Device #2 outputs data


A serial device which outputs data continously could be mis-detected as a serial mouse. Some systems may also block serial ports when looking for modems.