IIRC the 43mm is the OE and the 44mm is the NE. Same saw same stroke OE 44cc NE 50cc.
346 OE is 42MM equivalent Stihl is 024
NE is 44.3MM equivalent Stihl is MS260.
Shep
The stoke is longer on the Husky though - 32.5mm vs- 30.0 on the 024 and 32.0 on the 260....
Also the MS260 doesn't have a 44.3mm bore - it is either 44.0 or 44.7, depending of the version.