Chainsaws

I would like to purchase a husky562XP chainsaw. Would like to convert chain to 325 21;16inch bar. what sprocket do I use if it is possible. Will the shorter chain and 325-9 work properly or will we be under utilizing the power of the saw. I have 10 chains for my Jonsered 4159 turbo which is getting old and would like to be able to use them