earn "a / one's" bachelor's degree in...

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Ron earned a bachelor’s degree in chemistry from the University of California, Santa Barbara and a Ph.D. in organic chemistry from the University of California, Berkeley.

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Amanda earned her Bachelor’s Degree in Advertising/Public Relations and Health Communications from Grand Valley State University (GVSU) and is currently working towards an MPA at GVSU in Nonprofit Management and Leadership.

  • earn [color=red]a bachelor’s degree in…
  • earn [color=green]one’s bachelor’s degree in…
    Are these interchangeable?

Yes, as long as context make the recipient clear.

Thank you, MM.