All the series W124 are basically the same shape ....
E being the saloon up to 93 then E becomes the saloon and coupe
CE being the coupe until 93 when it becomes E
TE or T being the estate until 93 when it becomes E
Pre 93, cars were badged for example 300 E whereas after 93 it became an E 320.
However, coupes pre 93 could have been a 230CE, 300CE, or 300CE-24 but after 93 the engine size was changed and they became E220 or E320
Estates pre 93 were 200TE , 230TE , 300TE or 300TE-24 afterwards, they became E220 or E320
Saloons that were 200E ,230E ,260E 300E or 300E-24 became E220, E280, E320 again some of the engines were phased out on the facelift.
So basically pre 93 cars are badged 200, 230, 260, 300 E
Post facelift cars are badged E 220, 280, 320
There are anomalies though such as the w124 E500/500E , the E36 AMG and the american market 400E but don't worry about them
I think thats it, if anyone else can think of anything i have forgotton, please add it on. Cheers