Motherbord swape

Hi, from my reading these two, it may not support the same CPU!???

http://www.ascendtech.us/apple-24-imac-a1225-intel-logic-board_i_mba8202110pg478 .aspx

http://www.ascendtech.us/apple-24-imac-a1225-intel-logic-board_i_mba8202301pg478 .aspx

What speed frontside bus is your 2.8 CPU... I'd look it up, but having connection problems.

Could this be the problem with your 2.8 GHz board I wonder?

http://www.mac-forums.com/forums/apple-desktops/271845-logic-board-compatibility .html