Perhaps:
If you live at number 4 try number 9, or vice versa
People often write 9's like 4's, or vice versa
We live at number 4 and often get post for number 9 and vice versa
Love Miko, or Vice Versa
I once saw Tosh from The Bill at Derby station c. 1995. He was wearing hot pink track suit bottoms, looked confused, and was talking on a phone box. Do I win a prize?