Generally the 670 is the same saw as the 266xp. There was also a 268 with closed ports at about the same time the 272 replaced the 266.
Jonsered 625 is same as Husky 61 (open port "base" model)
Jonsered 630 is similar but closed port hot rod similar to Husky 162;
Jonsered 670 corresponds to Husky 66/266.
Be aware that there are some obvious diff's, like plastic covers and handles, and some less obvious ones like diff's in cylinder/piston outsource mfgrs, especially between periods of production. There were also an early and late style cranks with different clutch mounting threads. The original husky 61 was first available in around 1977, and the design didn't change much until the "3" series about 10 years ago.