You should ask company B's immigration attorney to answer this question for you. They are paid to communicate with you. They know the facts. As a general rule, you can use that stamp provided the new petition was filed and is approved.
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Can use stamp however would need to file a H-1B port.
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If you have spent time in your home country before filing the new H-1B petition, then you cannot do H-1B portability or H-1B transfer. Your I-94 is specific to your employer. I believe you would have to get a new H-1B stamp based on the new I-94/ Notice of Approval.
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I concur with Counsel Segal's opinion that the best source for any valuable inquiry on your pending immigration case is Company's B immigration attorney X.
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