Saber and Saber Extra are not the same character, dual persona tag removed.
For information why, check their wiki entries.

Dunno how to add tags but this is for Fate/Extella, the upcoming game. It's one of the exclusive preorder bonus goods, for Sofmap I think.

Edit: Added tag

The origin of this image is most likely this one. It is a sample. https://www.4gamer.net/games/337/G033789/20160610002/SS/006.jpg
They removed the sample watermark and used an upscaler which caused artifacts that can be seen in the corners. If you look at Artoria Pendragon's eyes you can see small traces of the sample watermark.

Edit #1: The hair of Artoria near her right ear you can see that the lines aren't right. Nero Claudius's lines around the left armpit: both lines should be connected exactly where the sample watermark should have been.