Two Approved Petition for same employer. Which one is valid

USA H1B Visa
1

I have an Approved Petition for Client A for X Location and also have an Approved Amended Petition for same client for Y location both the petitions are Valid with the same end Date amd my employer is also same.Can I switch between Client A and Client B without filing any Amendment before the Petition End Date

2

From what you explain here, Petition B for Y location appears to be the valid document.

3

Why petition A for X location is not valid?

4

Because petitionor requested to amend it and uscis approved the amendment . If you want to go back , again request an amendment

5

But my employer confirms that both the petition are valid. Are they lying to me?