If you are going to provide two actor references you can use this one.
https://docs.unrealengine.com/en-US/BlueprintAPI/Utilities/Transformation/GetDistanceTo/index.html
If you are going to provide two actor references you can use this one.
https://docs.unrealengine.com/en-US/BlueprintAPI/Utilities/Transformation/GetDistanceTo/index.html