I figured that you would like my opinion?
So from what I see, the 4n Leptotes has it all over the 2n plant. And yours is very typical to what I generally see in show displays.
Two n looks more 'spidery' if you will. Segments on the four n look fuller and shorter. The overall proportions are very good. Without a ruler I can't tell if the segments are indeed shorter on the four n or is their overall fullness making it appear that way.
I see a superior lip on four n as well. It appears fuller and with a deeper, richer area of amethyst. It looks shorter in length but that again could be due to the fullness.
And lastly let me say that the substance appears to be much heavier, stiffer if you will and the flower presents so much better!!
And finally, I will say that I am looking to add Leptotes bicolor to my collection and if I saw Ms. 4n, I would be all over it!! Like "white on rice"!!