10-4
162SE/61/66/266SE/XP/268/XP/272XP Husqvarna 625/630/SUPER/670/SUPER/CHAMP Jonsered all the same chassis.
There were some slight variations though, coarse thread vs. fine thread for the clutch and early saws use a two piece ignition vs. later one piece ignition so different flywheels and cases accordingly. But all one stroke so all top ends can be swapped (with related intake stuff, 61 had its own unique intake block ( not positive but the 66 may be the same), I believe the 162SE, 266, and 630 share a block, 268 and 272 share a block, 625 and 670 use a boot) and most covers.
Joe