code: def match_dim_specs(specs1, specs2):
      
      if (specs1 is None or specs2 is None) or (len(specs1) != len(specs2)):
          return False
      for spec1, spec2 in zip(specs1, specs2):
          for s1, s2 in zip(spec1, spec2):
              if s1 is None or s2 is None:
                  continue
              if s1 != s2:
                  return False
      return True
docs: Matches dimension specs used to link axes.
  
      Axis dimension specs consists of a list of tuples corresponding
      to each dimension, each tuple spec has the form (name, label, unit).
      The name and label must match exactly while the unit only has to
      match if both specs define one.