... and if OP wants to use already existing sub, use its reference ...

...

sub two_subs
{
  ...

  return
    { 'first'  => \&ElseWhere::first
    , 'second' => \&ElseWhere::second
    } ;
}


#  In ElseWhere
...
sub first  { 'first(): '  . shift  }
sub second { 'second(): ' . shift  }
...
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