The main source of difference is, basically, height. And a MYP Teela should *also* be shorter than the main MotUC Teela.
1) It's a pretty standard variant of the "can't discuss anything past King Hsss/etc" answer, as opposed to when they really want to shoot something down.
2) They'll probably wait until they see how Young Adam does before seriously planning a Young (MYP) Teela.
[PS: Dear lord, did someone go around the internet attempting to purge all trace of the MYP designs? A full-body MYP Adam was even *harder* to find than a MYP Teela, and both are still fanart and merely close to the models rather than bang-on...]