H1 extended while working with Client A and going for visa stamping while working with Client B

[amuda2010]

I am on H1 and currently in 6th year. My i-140 is approved. My project ended recently. I was in EVVC model. When I was in the project, I had sent for my H1b extension and got the extension for another 3 years.

When in future I get my next assignment, and then go for visa stamping by taking future client's letter, will it create any problems. I mean when I got my H1 extension I was with a different client and when I go for visa stamping in future, I will have a different client's letter. Will this make any issues ?

Please advise me.