begin{center}
  begin{tabular}{rl}
         text:&text2\
              &text3\
    something:&other stuff
  end{tabular}
  vspace{stretch{2}}
  begin{tabular}{rl}
                             text:&text2\
                                  &text3\
    something of different length:&other stuff
  end{tabular}
end{center}