Okay here are the differences that I know off:
A-2 identical to A-1 except for the RATO attachment points.
A-3 Trainer with dual controls and instruments.
A-4 Identical to A-1 except for larger wing span and area, insert ailerons
instead of trailing ailerons, and strengthened main landing gear. Improved armour for crew protection.
A-4/Torp was a torpedo bomber version.
A-4/Trop was a tropical version with sand filters, cockpit sunblinds and desert survival equipment.
A-5 used Jumo 211B-1/G-1 engines.
A-6 identical to the A-5 but with a cable cutting device to cut anti bomber balloons.
A-6/U was a maritime patrol and had the underside gondola removed.
A-7 identical to A-5 but with dual controls.
A-8 was a balloon cutter with lighter weight cutters in the wings leading edges.
A-9 was a tropical version with sand filters and sun blinds.
A-10 was a tropical version of the A-5 with same modifications as the A-9.
A-11 was a tropical version with enhanced modifications of the A-10.
A-12 Dual Control version with air brakes, underside gondola and all armament removed.
A-13 low level attack version with air brakes and bomb sight removed.
Additional armour for crew, engines and fuel tanks.
A-14 improvement of the A-4 with additional armour, balloon cutters, and an additional MG FF.
A-15 was a pure bomber version with an enlarged weapons bay to accomadate 6614lb of bombs and no undernose gondola.
A-16 dual control version of the A-14.
A-17 was a torpedo bomber. Foward fuselage was modified to carry a large bulged fairing to adjust torpedo guidance mechanism before release.
C-1 was a heavy fighter version wiht improved armour, armament. None were produced to lack of BMW-801 engines.
C-2 Heavy fighter version powered by Jumo-211B-1 engines with less nose glazing and improved armour.
C-3 Identical to C-2 but powered by BMW-801 engines but not developed.
C-4 Heavy Fighter powered Jumo-211F-1 engines and later by 211J-1/J-2 engines. Also had a larger wing span and area, and additional 2 MG-FF.
C-5 powered by BMW-801 engines was a heavy fighter and had the MG-FF replaced by MG-151/20. The underside gondola was replaced with a weapons tray containing 2 MG-17.
C-6 heavy fighter with additional armour and some without the ventral gondola.
C-6a day fighter version of the C-6b
C-6b night fighter version with a FuG 202 Liechtenstein BC, or a FuG 212 Lichtenstein C-1 airborne interception radar.
C-6c same as C-6b but fitted with FuG 220 Lichtenstein SN-2 airborne interception radar. This radar was able to deal with 'Window' (or 'Chaff' as the Americans called it) that was ejected by the British bombers to create multiple radar echoes.
FuG 227 Flensburg, radar tuned to the british 'Monica' tail-warning radar of the British bombers.
FuG 350 Naxos Z radar, tuned to the British navigational H2S radar
and later aircraft recieved the "'Shräge Musik".
C-7a day fighter version of the C-7 similiar to the C-6.
C-7b night fighter version with 4 underwing hardpoints to increase the weapons load to 3,307 lb (1.500 kg).
D-0 recon versoin powered by Jumo-211G-1 engines and had the weapons bay removed and an additional fuel tank installed. Camara installed.
D-1 same as D-0 but powered by Jumo-211J-1.
D-1/Trop was a tropical version with the sand filters and sun blinds and was later designated D-4.
D-2 identical to D-1 but with provisions for drop tanks.
D-2/Trop was a tropical versoinw with the same modifications as the D-1/Trop and later called the D-3.
D-5 came standared with 3 camaras instead of 2.
P-0 antitank version fitted with a 75mm KwK tank gun in the undernose gondola.
P-1 identical to P-1 except that the 75mm KwK tank gun was replaced by a 75 mm (2.95 inch) PaK 40 with a larger muzzle break to reduce the recoil of the cannon, and electro pneumatic operation. The nose was also solid instead of the glazed nose.
P-2 was armed with 2 × 37 mm BK 3,7 fixed forward-firing cannons.
P-3 same as P-2 but with better crew armour.
P-4 armed with 1 × 50 mm BK 5 anti-tank cannon.
R-1 same as C-6a except powered by BMW-801MA engines.
R-2 same as C-6c but powered by the BMW-801MA engines.