Component as parameter

If I understand the intention correctly, which is to call the function on the given type of script, then there are a few ways to do this. Not sure if this is suitable for your exact problem, but an OOP organized way with generics would be something like this:

 using UnityEngine;
 
 public class TestClass : MonoBehaviour
 {
     private void Start()
     {
         gameObject.AddComponent<ExampleFunctionClass1>();
         gameObject.AddComponent<ExampleFunctionClass2>();
 
         DoFunction<ExampleFunctionClass1>();
         DoFunction<ExampleFunctionClass2>();
     }
 
     private void DoFunction<T>() where T : MonoBehaviourWithFunction
     {
         gameObject.GetComponent<T>().Function();
     }
 }
 
 public abstract class MonoBehaviourWithFunction : MonoBehaviour
 {
     public abstract void Function();
 }
 
 public class ExampleFunctionClass1 : MonoBehaviourWithFunction
 {
     public override void Function()
     {
         Debug.Log("Function from 1!");
     }
 }
 
 public class ExampleFunctionClass2 : MonoBehaviourWithFunction
 {
     public override void Function()
     {
         Debug.Log("Function from 2!");
     }
 }
 

This works because C# knows any type derived from MonoBehaviourWithFunction will have the Function() and the DoFunction<T>() knows that you will tell it which type to use.