New Motherboard for MacBook

Last week, Apple started shipping MacBook featuring a new motherboard. There is no real difference between the new board and the previous one, regarding performance or battery lifetime, it simply adds full support and compatibility with Energy Star certification. So, only the internal power connection has been modified.
The new motherboard is not compatible with the previous one, as two connectors are different; and if you wish to know if the new or the old one is sitting in your MacBook you would have to entirely disassemble it as there is no reference of such card in the About this Mac menu (serial