Can two unrelated teams have the same team number?

I am in team 42700. Our robotics team does Frc and uses the number 4270, as does our Vex iQ team. Would it be possible to use the same number with a different letter? I’d love to have 4270 without the extra zero.

4270 was used by another organization. I am not sure you can get a past organization’s number. Check with your RECF Regional Support Manager.