They're different things. LGA = land grid array = refers to how the processor die is attached to the substrate material and a bit about the socket type the CPU plugs into. It's about the CPU package.
It has nothing to do with the actual number of CPU cores.
as WR2 mentioned above the LGA reffers to the processor socket number 1136 - 1156 - 775
not the X58 or x48 this is the socket model
the dual core like pentuim 4 CPU is LGA 775 so there is no diffrence its like asking about the car and the engine so do you got it