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I forgot to update this yesterday but here is the final answer (thanks Irin Thirdwater!):

=(if(K3=if(F3=G3,1,if(F3=H3,2,if(F3=I3,3,10))),"ok","WRONG"))="ok"

=(if(K3=if(F3=G3,1,if(F3=H3,2,if(F3=I3,3,10))),"ok","WRONG"))="WRONG"

First line with green highlight, second with red.

Hope this helps in case anyone else needs it!