I guess, but that seems unusual. Pins are split all the time, for instance to turn a 6pin PCI connector into a substandard 8pin one, but the reverse? Merging

I guess, but that seems unusual. Pins are split all the time, for instance to turn a 6pin PCI connector into a substandard 8pin one, but the reverse? Merging multiple source pins into fewer output pins by shorting them together? Visual inspection would normally catch situations like that, and then you might be able to figure out if it's okay with continuity checks and voltage checks with a multimeter on the relevant pints of the psu to see if those pins are different voltages... as long as the PSU powers the connector in the absence of load or sense pin signalling.