By googling images of "<king's name> crown" one can see plenty of Sasanian coins and representations (consider some kings had many crowns). The crowns of Ardashir I (not the simpler Parthian one, check the famous Ardashir Investiture Relief, he's the one on the right, page 60 in https://archive.org/details/TheTwoEyesOfTheEarth/page/n83/mode/2up), Shapur I and Shapur II look quite similar, like the ones of Heroes 3, 5 and 2 (without the little "crescent" on top), which I'd assign in that order since Ardashir I was the father of Shapur I, and Shapur Il came way later. Then Khosrow I looks like Hero 1 and Khosrow II looks like Hero 4. Choosing some favorable representations for this choice: Ardashir I, on the right (Hero 3)   Shapur I (Hero 5)   Shapur Il (Hero 2)   Khosrow I (Hero 1)   Khosrow II (Hero 4).  

Any thoughts on who should be who?  

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Thanks! I will work on this. Almost everything is different though so I’m not sure where to start  that’s partly why I was putting some of the info here. and calling me at least, a developer is way too kind

Doesn’t matter, the power in the game would be the combination of bow and arrow. So, for the first point the consequences were ok, just badly explained, the second point would have been wrong, except in very specific combinations of armour and distance, and the third point was somewhat misleading, but maybe acceptable.