What is the law on early fill with dose change?

If a customer turns in a new prescription for same medication of schedule two, oxycodone, early according to last fill. Yet the strength is higher but amount, medicine and dosing schedule is the same. Last one is for 20mg every four. New one is half to whole 30mg every four. Can it be filled?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums