What make and model laptop are we looking at here? You can check with the support site for your laptop to see if the upgrade is supported.
You might want to run CPU-Z and see what socket you actually have there since the FCBGA1023 is a soldered on CPU (FCBGA = Flip Chip Ball Grid Array) which would be interchangable (by a professional with the right equipment) while the PPGA988 and FCPGA988 sockets (from what I have read) are not. I will attempt to get confirmation of that.