Iran does manufacture a lot of drones, including similar looking ones.
Renaming another country’s weapon is a very weird propaganda move. Why would anyone do that?
For example, the Storm Shadow missile in the UK is essentially the same as Scalp missile in France. Yet whoever produces chooses a name.
Renaming a Russian made drone is WEIRD. You can only name the weapons you make.
https://www.oryxspioenkop.com/2019/09/the-oryx-handbook-of-i...
Also would not be surprised if there was knowledge sharing either previously when their let them clone the main Shahed variant or even to this day.
Many also describe the US-made LUCAS drone as a Shahed clone, which clear up what role this system fills.