Yes. One AHU can supply different grades of Air (Grade B,C, ect). This is common for gowning into an area. The gowning rooms are typically lower Grade than the processing rooms, yet the air will come from the same AHU. The difference in the areas might be the number of HEPA filters, the location of the returns, and the air exchange rates in each area.
That being said,be aware when mixing different types of products, as cross contamination is an issue. In this case you might need two separate air handlers (in some cases two separate facilities, for example for beta-lactams like penicillin).
Also, be aware of the returns - any air going back to the AHU in re-circulation must be thought through, as there is some risk for cross contamination. At times re-circulation isn’t an option, at other times it is ideal (to save on utility costs).
If re-circulation is an issue, you can have some areas with return duct work for low/no-risk areas, and other areas which do not return (vent to atmosphere).