Q: Is the R-3W phase sensitive? What if the GREEN lead was accidentally wired to L1, L2, or L3?

A: The R-3W is phase insensitive. The circuitry behind each of 4 leads (Yellow, Red, Blue, & Green) is identical. If the leads are incorrectly wired, the front phase indication would be incorrect, but the core functionality of the R-3W would stay the same.