[Build Help] Difference between these two i7 4790k Processors

Hi,

I was wondering if anyone could shed some light on what the difference is between these two processors:

a- http://www.scan.co.uk/products/intel-core-i7-4790k-lga-1150-haswell-quad-core-40ghz-base-44ghz-turbo-1250mhz-gpu-89w-cpu-retail

b - http://www.scan.co.uk/products/intel-core-i7-4790k-lga-1150-haswell-quad-core-40ghz-base-44ghz-turbo-1250mhz-gpu-88w-cpu-retail

Apart from B being £21 cheaper, is there any difference between these two products? Thanks for the help.