[ForSale-Swap] Drake vs National Power Supply Pinouts?

[Don Merz]

I picked up a National power supply at the Cuyahoga Falls Hamfest. It's a blue-cased one with a shiny front, quite large actually. I noticed that the power plug is the same one used by Drake (for stuff like the B line and TR-4 line) with six pins one direction and six more at right angles, in a rectangular overall shape. 
I assume this is pure coincidence? No chance the pinouts would be the same between the two brands? Maybe like we have today with Icom, Kenwood and Yaesu all using that same power connector and all wired for 12VDC the same way so the power cords are interchangeable.
Any thoughts?73 de N3RHT