Sort of the same. Basic chassis is pretty much the same...case halves, rotating assy, jug, carb etc. You can put all of the Jonsered covers, tank, etc on a husky, or vice versa, but they all need to go together...cant mix and match.
Do you have a junk 670? I'm looking for a rebuildable core...I have an extra 272 husky jug, carb and piston, want a Jonsered 625/630/670 carcass to build on. I think I have a top cover for either a 268 or 272 laying somewhere.