[PMoz99]

Hello Michael.
The modifications to the Mig-1 to turn it into a Mig-3 were no different to those you find within many models of other aircraft which retained their basic name - Hurricane, Spitfire, Bf109, P-40, P-47.
Apart from the canopy change, there was also a small oil cooler duct added under the nose of the Mig-3.
The Russians have a tendency to give a slightly modified aircraft a new name - just look at their current list! - so don't get put off by that.
There were only 100 Mig-1's vs 3100+ Mig-3's, which makes the type almost insignificant, and it is also an indication that the Mig-3 was a development rather than a new design. The 100 Mig-1's were almost just prototypes for the Mig-3.
I don't want to give you new ideas, but unless you're planning on looking at aces in aircraft sub-types, I'd put the Mig-1 with the Mig-3.
Cheers
Peter