The Italeri M1A1 with resin and the M1A2 are the same basic kit both released around the same time and are both original Italeri kits. They sort of goofed when they made the kits; the straight M1A2 was a rather rare version of the Abrams only used by a few battalions in a couple of divisions for a few years before it was replaced by the updated M1A2SEP.
They also made a mistake when they tooled the back deck (engine compartment). They molded a few of the grills in place on the upper hull that should be molded onto the removable part of the back deck. In other words, when the deck is removed to replace the engine, those grills are a permanent of the deck and would not be able to stay on the upper hull. So the engine compartment and resin engine set up are incorrect.
Compare the kit's smaller "T" shaped compartment to this Legends Model correct compartment. Notice how the four small grills that are on the Italeri upper hull are actually on the removable back deck of the Legend part.
