Will both the first and second printings fit into the FFG Mini USA sleeves (41x63mm) or does the second printing require larger ones?
No the USA mini is smaller then the MINI EURO which is what the 2nd print was done in (without our permission). The third print will be back to USA mimi.
So if you have the 2nd printing you need to get the MINI EURO sleeves which will fit the mini usa expansion. 44x68mm (red FFG, light blue Mayday)