You mean Socket P. Socket P is a mobile socket. It does have 478 pins like the old desktop Socket 478 for Pentium 4 and Celeron processors.
A Socket P Core2 will fit a Socket P board. Not all motherboards are compatible with all CPUs though. You need to check the exact model board with the exact model chip. You should be able to find the info on the motherboard manufacturers website.http://en.wikipedia.org/wiki/Socket_P