What to do regarding an H1b transfer with receipt notice on OPT if changing employers?

Question Details: I am on my OPT. Company A filed an H1b petition for me. It is selected in the lottery and is currently under review for change of status but yet approved. However, I got another exciting job offer from company B. Can company B file amendment on exiting petition to transfer my H1b from A to B or can company B file a new H1b petition immediately irrespective of exiting petition from company A? What if company A withdrew their petition immediately in both cases?

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