You reckon they are THAT different?
Am I insulting people when I say that from certain angles I can hardly tell them apart?
Opposite ends of the spectrum. The Hurricane was the ultimate development of the pre-war Hawker bi-planes, with its thick wing and complex steel tube and wood construction. As such, it was already as developed as it could get.
The Spitife was 'new technology'; all-metal, stressed skin, thin wing. It went on through many marks of development and was still a front line fighter after WW2.
They can look similar at first glance, but the Hurri's thick wing and humped-back and more dumpy appearance than the sleeker eliptical-winged Spit are the give-aways.