I suppose the major difference is 'application'. The two go hand in hand really, with the only true difference I personally believe to being how you use them. A person that loves knowledge can be just about anyone; a gossiper, nosie neighbour or even a psychology student. What they do with that knowledge or how they use it, is what is the key difference. If you love Wisdom, you apply the knowledge that you have learned in benificial ways to yourself or others around you. So, in a sense, if you love wisdom, you probably practice it; And it's probably assumed they are lovers of knowledge aswell. They just put knowledge to productive use(usually good).