Impact of change of Employer(approved I-140) on pending H4 & EAD approval

I am on my H1B with approved I-140(since more than a year) with my existing employer.
My wife’s H4 visa & EAD are pending approval.(receipt date - 08/2020)

  1. If I change my employer & the current employer withdraws H1B & I-140, would that affect my wife’s H4 & H4 EAD?

  2. After H4 visa approval for second employer, Can I use approved I-140 from previous employer to apply H4 EAD?