Doubt on Approval Generation while Change requisition

 Hi All ,

I have created a requisition with some amount 1000$ .

It has generated the approver's list upto the requestor's Supervisor hirarchy .

My Requisition Approval is using AME and it is customed .

After approved the Requisition and I have created the PO (manually) .

And Later I have changed the requisiton from 1000$ to 1M Dollars .............  Now, also the requisiton generating the same approval list which is generated at the time of new requisition creation .

It should generate the requestor's supervisor hierarchy upto 1M dollars amount limit .

The approval list generation , while creating the new Requisiton and change requisiton will be same or different ??