I actually owned a 72 amc javelin, the Amx was the same car with a shortened wheelbase and only 2 seats. The crossfire is more similar to the amx than the javelyn. But u can say both of the cars are similar but theres no other connection than both having 2 seats, big engines, and both are head turning rear wheeled drive cars.
And i agree if Chrysler or back then Daimler had named the crossfire the AMX they probably would have sold many more of them, but like everything else Daimler botched this up also, kinda like they basically killed Chrysler.
In the late 90's Chrysler was the most profitable car company in the world (even more profitable than Toyota is today). Chrysler also had about 10 billion in the bank for future R&D. Then Daimler bought Chrysler, looted them and botched basically every good thing about Chrysler.

The only good thing to come from the merger was the Crossfire, of which I own 2!