I'm assuming you have to be talking about the PS32 board set, right? Most certainly that top board is not in any compatible in form or function with any of the PS/2 board pieces.
The Stacker board on top of the PS32 board set has the same connectors as a PS/2 board and is intended to be used as a replacement for dead PS/2 board of either the 3V or 5V logic when used with it's companion PS/3 bottom board.