Hi David, both bearings are identical in dimensions, but the ratings differ. Bearingboys are selling RHP bearings, whereas Bearing Shop UK, brand varies. RHP have been around for many years and are a merger of three well known bearing manufacturers, Ransome, Hoffman and Pollard from pre 1970's era to become Ransome Hoffman Pollard Limited and are very good quality. The various brands that Bearing shop sell could come from any where in the world, they may or may not be as good or better than RHP's but price often reflects what you are buying. You will have to decide for yourself if you need a high reliable unit for your needs, or if a cheaper version will fit the bill.
Regards Nick.
P.S. I have no connection with RHP or any bearing outlets of any company.