Expected chainline from 103 mm bottom bracket to 107 mm bottom bracket? Frame Windsor - The Hour

Hub Width     - 120mm

Stock Bottom Bracket Sizing - 68 x 103 mm 

Miche Bottom Bracket Sizing  - 68 x 107 mm

Miche Crank Set Requirements  - 68 x 107 mm bottom bracket 

I'm looking to grab a pair of Miche cranks which call for a 107 mm bottom bracket (most likely the Miche primato).  My bike currently has a 103 mm bottom bracket.  Will the 2mm difference cause issues with my chain line?  

On Sheldon Brown's site, I read that 107 mm is best for 126 and 130 mm hub spacings.  I've also read that the Miche Primato has adjustable cups for tuning alignment.  Would this be enough to compensate for the extra 2 mm on the drive side.
I agree with @Mac that you may not be able to tell the difference between 103 and 107. If your current 103mm is in good shape, why not buy the new crankset and try it on the old bottom bracket? Evaluate the chainline. If it's good, you are done. If the (front) chainring is too far inboard, buy the 107mm bottom bracket.