Change of client while RFE status in fresh cap 2018


I have applied for H1B during fy 2018-19 fresh cap

My petition was picked in lottery and now in RFE Status.

I was with client A while I applied for the H1B fresh cap 2018-19 now I have move to different client.

For the response to RFE Can I provide client letter and other necessary documents for a different client say client B ?

Kindly throw some light on the option available for to get H1b