Is H1b Amendment required, if change client in within 10 miles

I work in EVC model and i have changed my previous client (like worked for Clinet A and moved to client B, applied extesion on Client B letter…got 3 years extension, Now I am planning to go back to Client A)… Imp thing: both the client locations are in 10 miles radius and same county.

DO i have to go for amendment? or LCA is fine... please provide your update

Can anyone reply to my question asap