Guys, who contributed to the 'Make Tk Optionmenu same height as Button' thread: I apologize for my comments.

I'have looked at it again and again and I have to admit that it is probably true that at some value for -pady the y dimensions of those widgets are exactly the same. The type of the geometry manager makes no differnce in that regard. It may be the construction of the Optionmenu (which has more space inside it) which leads me to some strange optical illusion that it is not the same size as the Button.