Are these (unreferenced) studies the same ones that e.g. Lise Eliot mostly correctly criticizes as being poorly done (and often not replicable) to the point where they tended to report differences between male and female infant or child brains that don't seem to actually exist (and/or may just read out differential socialization)? (Not to mention that the popular and/or ideologically driven accounts of these studies often were at odds with the results of the studies.)

The 90s/00s were not the best time for high-reliability imaging studies. fMRI especially had a bad time of it because of poor statistical methods.

There are good studies which draw appropriately measured conclusions and which can be interpreted in a sound way, but there is also a lot of less-than-sound stuff out there. It would be nice if you could at least reference a review article whose conclusions agree with yours. (A doctoral dissertation is fine also.)