Normally, the appraisal has to cover the amount of the LOAN.
How do you know the amount of the Appraisal; normally they will only tell the Bank,
and you have to request (and pay for) a copy of the Appraisal.
If you talked to the Bank, why don't you know whether they will accept the Appraisal?
Normally, you can request another Appraisal, as long as you pay for it.
And if you know all of this, why are you not asking your Buyer's Agent?
Good luck and may God bless