H1B amendment and received approved petition -Do i need to go for PA for stamping ?

I have relocated from client A to client B with same employer and my H1B amendment was approved.

In my passport i have old WP number and for amendment i got new WP number.My visa valid till mid of 2018

I am travelling to india - do i need to get stamp with new WP ?

any Drop Box or PA is required on this case ?