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Actually from what I can tell, the 268xp is like a smaller 272xp. Bigger filtration, bigger exhaust, top cover and so on. Parts are all different between the two. They just happen to be the same size.
According to the IPL etc. story, the 272xp replaced the 268xp as the top model in this "family" early 1991, and was virtually the same saw as a late production 268xp, except for the top end and decals (+ number tag of course).
At the same time they basically put the open port 66 top end on the 268, and called the result just 268 (no suffix). On many markets this 268 open port version replaced the (266 based) 66, but not on all.
In addition they continued to make the 268xp for a while, but called it the 268 Special. At least some of those saws said both XP and Special on them.
An other thing that happened with this model family early 1991 was that the 61 got the one piece coil and case + a lot of other (more or less associated) changes. A larger carb venturi and a larger muffler was part of this.
The top cover still was gray, but not the same one (more room was needed under it). Some time in 1993 the top cover was changed to orange color (not connected to any major internal changes, that I recall.
Production of the 66 and 266xp was transferred from Sweden to the Tomos factory in Koper, Yugoslavia/Slovenia at some point, but I haven't been able to pinpoint it on the time-line (the 66 may have been made there all the time, for all I know). Possibly the pre-1991 61 has been made there as well, and the 162SE certainly has.
Then there are the Brazilian production, concerning the 61 (post 1991 version), 268 (open port version) and 272xp - that should be fairly well known, and still is going on.
The above is "as far as I know" at this point, it isn't necessarily the eternal truth, carved in stone.
