Can approved I-140 from previous employer be used for multiple H1B extension petition filing until approved I-140 from current employer

My I-140 was approved in 2017 and I recently changed my employer in Mar 2020. My 6 year max out is on Oct 2020. My new employer has filed a H1B petition for 6 month and its approved. Now after the current H1B petition expires on September 2020, will my current employer be able to use approved I-140 from previous employer to file my subsequent H1B extension or do we need my new employer to start my green card processing and have an approved I-140 before filing my next H1B extension petition.

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Thanks Anil, that helps. Appreciate your help.