There doesn't seem to be any reason to have the Me410A. The engines are no different and all its gun loadouts are matched by some B model's. Its lighter weight (if they really did beef up the frame for the planned DB603G) and/or bomb loadout options might make it worthwhile, or it could spread out the loadout options, if there's not enough room in the hangar for all the different configurations. If we try and remove redundant configurations to narrow down the options, we can pick pick them so that we get:
A lightweight cfg: The B1 (2x131 + 2x20mm), or B2/U2/R2 (2x20mm + 2x108). The A1 is the same as the B1, but with MG17s instead of MG131s. Ironically, both the A1 and B1 which people might pick to dogfight with, have that Stuvi gunsight.
A clean MK103 cfg: The B2/U2/R3 (2x103 + 2x20mm).
A 6x20mm cfg: The B2/U2/R5.
A BK5 cfg: The B1/U4 (lightest of the BK5 loadouts) with BK5 + 2x20mm, which probably walls up some of the glass cockpit since the BK5 is in the nose for this one. The B2/U4 would be the next BK5 cfg to include (2x103+BK5) since it's a more useful loadout than A1/U4 (2xMG17+2x20mm+BK5) for roughly the same weight.
Maybe a maximum firepower config.. : The B2/U4 (2x103 + BK5 in the belly) for strongest instantaneous firepower, which actually isn't that strange a combo, since they might have similar ballistics (835 and 860 m/s resp.). In a total firepower metric, it's by far either the B2/U2/R3 (a pair of 103s and 20mm's) or the B2/U4 (only if "30mm" means the MK103). That's just 12% less total firepower than a fully gunned 110G2 (4x20+2x30).
A torpedo cfg: B2/U3 with 1 torpedo and a pair of 30mm's, either MK108 or MK103.
Then there's options for drop tanks, WGr21 rockets (4x), and 50kg bombs on the wing pylons, which are on their separate section in the hangar selection. The only complication is the internal bombs, which ought to look like the 110G2's options, maybe adding something like 1/3 or 1/2 more options to the gun package options.