Pretty unlikely...
rather the red one. In fact, green and yellow were both used as line and neutral colors before harmonization, but red was never used for anything but ground (and phase in a 3ph 4w delta w/o neutral but with ground, in this case ground was grey like otherwise the neutral would be, quite confusing)
Anyway, I don't think I'll replace it, I don't like replacing cords that are still in perfect shape.
