Sony Motherboard Buyer Guide
It is not recommended to buy a replacement motherboard according to your laptop model number, since parameter maybe different for same model laptop.(for example, graphics card version or CPU version is different).
So the accurate way is to find the motherboard part number
How to find Sony motherboard part number ?
Sony motherboards usually have the part number near the memory slot on a white label. They usually start and end with an A and contain 6 to 7 numeric characters, sometimes separated by dashes (ex: A1211450A, A1175826A, A-1199-190-A, A-1143-861-A)