Vaio S motherboard models need help ASAP!

I need a mobo for a vaio vgn-s460p notebook. I used to own a s150 or something like that and recently bought the 460 broken for my brothers gf. He wanted me to find something decent and cheap so I bought one that needed a mobo because I know these are decent computers from past experience. I'm looking to buy one that goes off ebay in a couple of hours and was just wondering if there's any difference in the motherboards between the s2xx or the s460. I know they went to 533mhz bus support and faster ram on the 460's but I don't think they changed the physical layout that I couldn't put one of the older boards in the newer system? If anyone knows, it'd help.
Thanks!
Jeffrey

 

Turns out the prop with my notebook was the video card had overheated unless i'm mistaken. I think it must have had insufficient cooling for the nvidia card. The nvidia logo was actually scorched into the heatsink. I found a laptop repair place in CA that is replacing the chip for me. No one has these boards, I'm thinking probably because this is a common problem. Tons of the previous ati version boards available.