This should be a problem with a trivial solution, but still I wasn\'t able to find one.
Say that I have 2 matlab figures fig1.fig, fig2.fig
fig1.fig
fig2.fig
You can also go to File in the menu, Generate Code, for each plots. Then copy and paste both in the same mfile, with a "hold on" in between and changing details related to the appearance. Then run the new m-file.