The DOO9 is 9.0 mm. The D196 is 9.5mm. 2083 uses a DOO9.
I'm suprised the OP is finding more 196 bars than 009 though.
As far as the original question I don't know how the .5mm would affect the saw. I usually open up 9mm bars to 9.5mm for the older Jreds.
Hence why you find many older Jonsereds with the S-clip bar adapter on them.........had to find a way to use up all the existing bars in the larger mount pattern.