Impact on existing sales orders when Customer Ship-To site is associated with Bill-To site

Hi All , 

we are in  EBS R12.2.4.

Currently  in Customer Master Data at Site use level  we have Bill-to , ship-to defined individually 

Ex: Customer : XXX 

site use level :

Bill-To :  101

Ship -To : 102 

ship To doesn't have bill-to directly associated with it .

If  Bill-to  association is established to Ship-to,   ex: Ship-To :102--> 101 or different Bill-to location say 103 ,

Will it have any impact on the already existing sales order ?

Defaulting rule for Bill-to is

Ship-to.Bill-To

Account .Bill-to 

Any pointers  on this is much appreciated . 

Thanks .