How do I track an object of a specific type at collision?

Hi!

I have been looking around for this answer and can't seem to find it. What I want to do is keep track of a specific object when it hits a trigger of another object. As in, if I have a FPS Controller and it breaks trigger_1, I want to hold gameobject trigger_1, inside of the collision script (on the FPS controller) so that I can manipulate some variable inside the trigger. I would also like to do it vice-versa if possible. Here is an example:

 public PositionNode myPosition; //declared earlier
 
 void OnTriggerEnter (Collider other)
     {    
         
         if(other.gameObject.tag == "Position Node")    
         {
             Debug.Log("I am Touching a Node");
             
                 myPosition = other.gameObject;
         }
     }

This is just a rough example. I know that myPosition is a PositionNode and I don't know how to make sure that the script knows that the other's gameobject is a PositionNode as well.

Thanks for you help in advance!

-Charlie