Federal Courts of Appeal are limited in their decisions to their Districts. That's why differing opinions by different courts have to go to the Supreme Court for final disposition if the effect is to be nation wide. Perhaps a lawyer can confirm this.
Look at Obamacare. Two courts of appeals have ruled it constitutional; one has ruled it unconstitutional. As it stands, Obamacare is now unlawful in VA and the other states within that Circuit. RI COA does not rule in TX.