afni.nimh.nih.gov

The difference is that the first shows the space is TT_N27, a variant of Talairach space, and not the generic Talairach space. In AFNI, that space is defined by the manual transformation of the N27 dataset in MNI space to Talairach space by choosiing each of the marker locations and using a 12 piece transformation. The consequence of this variant of Talairach space is that the inverse transformation to MNI is known exactly and not the approximation the Brett transform gives.