1 service area business, 1 "office", 2 phones, 2 GMB listings. Merge without losing reviews?

Jan 19, 2015
The 2 GMB listings cover 4 counties, 2 each. The second one has been created a few years back and helped prop up the business in those 2 counties. Rankings are now dropping. If we merge both, would we lose the reviews on the 2nd listing?
Just to describe the office: It's the business owner's cell phone. She manages scheduling, payments, and staff almost exclusively that way.

Thank you for your help

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