I believe it should, I just put an electric start on my 700 and the directions were for both the 700 and the 600 and since the kit comes with a new clutch that would work for either sled I would assume they are the same taper. The only difference would be that the 700 came with the cover with the wide bushing, the 600 did not but its not a big issue.
If you want to know if parts will fit, get on a website, look up your part # and then use the feature that will show you which sleds that part will fit.
Sites like Babbitts, Dirtcheapsnow, and Partspitstop all have this feature.