The starting point is femininity. While there are definitely those who are no doubt TS, and those who are no doubt, JCDers, who not even when dressed ever feel or consider themselves anything but a guy, the minefield is a pretty darn large one for the majority of all who reside within the TG spectrum, which runs from the casual CDer to the TS. While most who are either in the CD side or the TS side do their best to establish a stone wall between the two, I am not convinced that one exists that is so contrasting. It can be for the most polar opposites within the spectrum.
Ultimately though, when one fully identifies as TS and is willing to begin living life in their identity, their lives are the ones who are most impacted by far. Yes, then it truly does become a big difference in the end, because rather than allotting a set amount of room for the femininity, or part of or however someone wishes to consider it, a TS person truly lives their life fully opposite their birth gender.
The minefield though, wow, I mean you see it all the time on here... the confusion that so many face, and sometimes taking many many years to figure out. If it was such a black and white division, we wouldn't be seeing so many who are not TS, but sometimes think they might be, begin going down the path only to realize it really isn't what they should be doing. TS people who think for the longest time they are not TS, just very feminine side CDers, if that even.
I am in no way trying to redefine anyone any more or less, lump us all in together as one big batch of TG. I am no trying to do anything like that. But, I do see that grey area so many of us reside in, the femininity that resides with all of us, and all of what we go through because of it. There are commonalities here, IMO, and that is not something that most on either side wants, but it is something I personally feel exists.