Jurisdiction is not the issue. The issue is whether you were DUI or not under PA State Law. Jurisdiction A and B are both within the Commonwealth of PA. PA has personam i.e. personal jurisdiction over you in every part of PA. Secondly, Miranda rights DO NOT TAKE EFFECT UPON ARREST i.e. custody. This is a big mistake made by law students and lawyers. Do you think because you are arrested, you must be read Miranda? Even if you are read Miranda, you must react assertively for these rights to trigger.
Miranda is a creative "right to counsel" invented by the Court and constructively applied to the 5th under self incrimination. Herein lies the problem of crime specific v. the true right to counsel under the 6th (to much explanation for this post).
The point is that custody (arrest) has nothing to do with Miranda. The officer may legally arrest you and NOT read Miranda. The fact is that the arresting officer HAS NO OBLIGATION TO GIVE THE MIRANDA RIGHTS UNTILL OR UNLESS HE BEGINS INTERROGATION (asks you specific questions). Then, you must assert rights. Miranda does not invoke proceduraly.