Do I have to file the amended federal taxes I’ve prepared on TurboTax if they make no difference on the return? I have efiled the state, which does make a difference.

No you do not in most cases but it would depend on what you changed.  

Thank you for answering.  I forgot to deduct my traditional IRA contribution. It made a nice difference on my state but federal remained the same. Since this changed my AGI, I’m unsure if I can just skip the federal amendment.