Hi.
The late war Sherman M4 A3 were often the M4A3 E8.This tank had a different suspension type than the early war variants.They were nick named the 'Easy Eight'.
The M4A3 A2 late war Sherman variant also had double thickness frontal armour, nicknamed the 'Jumbo'.
They are slightly differnt looking to early war Sherman M4A3 tanks.
But most people wouldnt expect you to buy more models if you used M4A3 in stead of M4 A3 E8s.
Well it wouldnt bother me or my gaming group anyway...