Some of the points in identifying the Sassanian coins are,
1] The crown each king or queen wears
2] The king's name is to the right of the king's portrait within the borders
3] To the right of the attendants on reverse is the mint mark
4] To the left of the attendants on reverse is the regnal year
Here is a nice article explaining it.
I think the coins are as follows,
Coin 1: Hormazd VI (I am not able to read regenal year and mint on reverse)
Coin 2: Khusro II, Mint - Yazd, RY#2
Coin 3: Khusro II, Mint - Istakhr, RY#28
"The saddest aspect of life right now is that science gathers knowledge faster than society gathers wisdom." ― Isaac Asimov
Blog :
https://parimalscoincollection.blogspot.com