Francis Dubreuil or Barcelona

The folks on antique rose forum discuss quite often weather Francis Dubreuil is Barcelona(hybrid tea 1932 Kordes). Most say that when side by side they are idenical. If Francis Dubreuil is a Tea then most likely it is diploid and if it is Barcelona then it most likely Tetraploid. Has anyone ever tested Francis Dubreuil to see which it is? Can it be done and would that pretty much determine for sure which it is?