Hi Sniglet, i know you can change the appearance of ML default players like Ordaz etc...
Using one of the PES editor’s on PC...
1. Open Option File (the main one that you intend to use)
2. Open Option File 2 (can be any Option File with the face you want to transfer across)
3. In ‘Transfers’ double click the player you want to change. So if you want to change Ordaz you double click him from ML Default Squad.
4. The select, i think, ‘Import’ from the bottom of Ordaz’ stats page.
5. This opens up ‘Option File 2’s’ database. Find the player that you want to paste over Ordaz.
6. Select wether you want to paste just stats, or appearance, or both.
7. Double click the player.
8. Then just change his name back to Ordaz.
9. Save, that should be it.
It definitely works for ML defaults, and i am sure it will work for the youth players. You just need to find them in the database.
Hope that helps