Form 1040 versus Form 1040-SR

I prepared a 2020 Form 1040-SR for a client, and the copy of the tax return that I gave to the client shows this was the case. I just realized that when I prepared the client’s invoice on my QuickBooks, I referred to the preparation and e-filing of the return as a 2020 Form 1040 instead of a 2020 Form 1040-SR. I already e-filed the client’s 2020 Form 1040-SR today, and I have been paid for my services. Should I communicate anything to my client in relation to this issue now? Should I just ignore it?

You could communicate it in larger font and fewer words.
What's the substantive difference?

It is not an issue in my opinion. None of my engagements or invoices ever reference a 1040-SR. It is always just 1040 and then whatever the state equivalents are called. My engagement letters do not even list states or individual returns, only that I will prepare tax returns for states and localities communicated to me by the client.