R12.1.2 : pre-requiste patch R12.ATG_PF.B.delta.3

Hello,

Our client is in EBS 12.1.2 currently.

We found in readme of the Patch 19258579(Latest CPU Patch for EBS) that it has 2 pre-requisite patches.
-R12.AD.B.delta.3
-R12.ATG_PF.B.delta.3

According to Pre-requiste Patch Oracle E-Business Suite Applications DBA Readme, Release 12.1.3 (R12.AD.B.DELTA.3, Patch 9239089) (https://mosemp.us.oracle.com/epmos/faces/ui/km/DocumentDisplay.jspx?id=1077769.1Doc ID 1077769.1), do we need to upgrade from EBS 12.1.2 to EBS 12.1.3 for apply Patch 9239089.

If it need to upgrade to EBS 12.1.3, please let us know how can apply the pre-requiste patch R12.ATG_PF.B.delta.3 for Patch 19258579(Latest CPU Patch for EBS) in EBS 12.1.2(i.e. without upgrade to 12.1.3).