title: ValueError: Can only compare identically-labeled Series objects
body: <p>here is my code, no matters what I do I keep on getting the error and followed all the index related solutions, can anyone help me?</p>
  
  <pre><code>site = pd.read_csv('../data/survey_site.csv')
  sampled = site.sample(n=1)
  
  site = site.reset_index(drop=True)
  sampled = sampled.reset_index(drop=True)
  
  mask = site.mask(site['name'] == sampled['name'])
  </code></pre>