I'm a man becouse it feels good for me to be one and it makes me happy, but up until the point where I defined myself a man, my experience could have been easily considered that of a nb transmasc lesbian. The reason I'm not is becouse I realized being a man felt better and than I realized by becoming one that I love men very dearly and that they are important to me. Outside of the word I use and that I no longer focus my sexuality on women, there is very little difference.
Gender and sexuality are a scam and the only way to come out with the least amount of bruises and loss, is to throw away petty labels and language that will never be able to define a person and just use whatever makes you feel good whenever you want and however you want, there are no rules that do not aim to hurt you.
As a trans man I now have experiences that are very specific to transgender men, but prior to this, I was a lesbian and that's something that I don't care to pretend wasn't there, I just found that I was less and less happy as one and at some point I realized that being a man made me happy the way being a lesbian had as a younger teenager and than it made me even happier and kinder and healthier.