Any difference between 612-0084 vs 612-0094 for LED backlight board?

Any difference between 612-0084 vs 612-0094 for LED backlight board?

For LED backlight board implemented on iMac 27” mid 2011 model, I found there are at least two designs Apple uses, 612-0084 and 612-0094, they look totally different with different connection type on the board, etc. Does anyone know the difference between these two types? And are they switchable?