Are the serial/power cables for all units electrically identical?
Almost. The earliest cables, originallly for the 310/330 family, provide less power than the current cables. They will intermittently fail to power a Meridian operating at maximum power consumption. This is most typically seen as the Meridians powering off or draining batteries when operating with the backlight turned on the brightest. It’s rumoured the oldest ones have black boxes for the regulators inline of the cable, but there isn’t a direct correspondence between color of the plastic housing and the regulator inside it.
