Ignitionbox ducati

Hi can someone tell me what different the black ignitionbox and blue ignitionbox ?
and the wide tire need cute down engine casings 1 cm or 2 cm ?
i had a wide tire kit and the washer is 1 cm but i had look the SIP catalog it look like 2 cm.
can someone tell me this?
thanks a lot!

The blue cdi is original equipment, at least it was on my PX200. The black cdi is a pattern part. There is no difference in the function between the two, however, when I fitted the black cdi to my px it was slightly larger and was hitting the rear indicator. I believe that SIP do a replacment cdi the is functionally improved.