Just because the CPU's are the same socket type does not mean that the laptop will accept a different CPU. Some laptops have the BIOS locked to the CPU that it comes with. For one laptops are built for a specific CPU watt rating and there for can't dissipate more than what they are built for locking out some options that Desktops have. But from what I could find they both have a 35watt TDP so it may just be that the BIOS is locked for the CPU that it came with.
In short you might be stuck with the CPU that your laptop came with sorry.