Are the rear struts interchangeable?

Hello,

Unfortunately, the left side strut will not fit the right side and vice versa.
So, you will have to get the correct side strut.

https://www.2carpros.com/articles/how-to-replace-a-suspension-strut-and-spring

I have attached the strut replacement procedure below for your reference.

Let me know of any questions.
Thank you.