Need to locate motherboard replacement

How can I determine the exact motherboard for my Compac Presario CQ62-418NR Notebook PC???? Amazon has several replacements along with many pictures, but my motherboard is still embedded inside my notebook. The only clues that I have so far are: (1) ACPIx64-based, (2) AMD SATA Controller, (3) AMD Athlon II P360 Dual Core, and (4) three stickers on a part inside that read.... CT:PX2100112061FR.... 31AX2MB0010..... and.... LAN:984BE1BAA0A6. I have a place that will install it, but it's up to me to have the replacement available. I would prefer not to buy a new PC because my wife has the exact same model (which I am using now) and as such we can keep the parts interchangeable in an emergency.