No, you haven't. There's been a whole lot of repetition of this claim, but it's not actually true.
What few studies have even been attempted...
1) do not control for sexual orientation and ignore that there is observed and known activity in the part of the brain associated with sexual attraction that is driven by orientation - homosexuality is observable
2) do not control of the presence of hormones, and we know that hormones affect behavior - if you're looking at transgender identified males who are taking estrogen, you will observe the impact of that on the brain - but this doesn't imply that they had differential brain activity prior to estrogen, so you're seeing a false conclusion
Furthermore, studies that purport to find differences in the brain activity between males and females that is NOT directly attributable to sexual attraction or to hormones find low levels of correlation that are generally different but extremely far from predictive. You can look at a very large set of scans where you already know each person's sex, and you can observe differences. But if you're given a scan where the sex is not already known, the likelihood of picking the correct sex is close to 50%.
There is one study that was done on a very specific set of people, that did find an observable and replicable pattern. It looked explicitly at males who were attracted to males, who had not undergone any hormone therapy or surgeries, and who had clinical levels of body dysmorphia from a very young age. It found anomalous activity in the part of the brain that is responsible for self-perception - the same area of the brain that lights up for anorexics. So if you want to make the argument that HSTS males have brains that genuinely perceive them to be female, we can talk about that.