H1B visa stamping client letter 6 months old


My client letter is 6 months old. Will that be okay for stamping my H1B visa?

Is the client project still valid or are there any validity dates mentioned on the letter?

If you are in the same project and there are no end dates mentioned, it should be okay.
The final decision still rests with the visa officer.

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I have one more question please.
I have mistakenly put my old DS-160 confirmation number on my H1B visa appointment confirmation page.
The visa was issued on this DS-160 last year.
Can I correct the DS-160 confirmation number now on my visa appointment confirmation page and how?