I94 Extension After Passport Renewal

USA
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1

Hi,

I have got H1B visa stamped in march with my old company. After that I got my H1B transfer to new company. Recently I have renewed my Passport. Is that visa still valid for I94 extension to cross the border?

2

Visa stays valid till the validity mentioned on it irrespective of passport expiry.

3

Is visa stamp valid irrespective of employer? @anil_am22