I've been to one all trans feminine event, the ill-fated Pacific Coast Living conference (it was supposed to be annual, but unfortunately there was only ever the one conference). The "feeling" to that was different than, say, the SisterSpirit retreat I went to last year. That was a women's spirituality event, and I was welcomed as one of them.
Now I should stress here that I felt like I was one of Them. That is to say, I did feel a bit like a outsider even as I was completely welcomed regardless of the circumstances of my birth.
What I'm saying is that from my point of view, this one trans feminine space felt different than this one feminine space to me. After all, there are medical issues that I would have in common with the attendees of the PCL conference that I wouldn't share with the attendees of SisterSpirit.
This is by not means a scientific survey. These are simply my experiences and will definitely differ from the experiences of others. For my part, however, being trans is part of my identity and that is an intentional choice I've made.