The longer the cable the more likely you are to have signal degradation or the line. So yes the FP connecter will likely have a lower quality than the back, will you be able to hear this is up for debate as it depends on the quality of the cable going to the front and the quality of the wire going to your headset. Because the lower the quality of the cable the greater the degradation will be over a given distance. Of course it also depends on how good your ears are and your perception of what you hear.. (So many variables)
Basically the only thing that could be said is try it out and hear it yourself the only one that can really give a good answer for what is right for you in this case is you.