var other : Transform;
if (other && transform.position != other.position)
    print ("I'm at the different place than the other transform!");

using UnityEngine;
using System.Collections;

public class example : MonoBehaviour {
    public Transform other;
    void Example() {
        if (other && transform.position != other.position)
            print("I'm at the different place than the other transform!");
        
    }
}

import UnityEngine
import System.Collections

class example(MonoBehaviour):

    public other as Transform

    def Example():
        if other and (transform.position != other.position):
            print('I\'m at the different place than the other transform!')