Is mastered Ultra Instinct the same as Super Saiyan Silver? V Jump magazine has released a picture of Goku with silver hair and a lot of people in the web is talking about "Super Saiyan Silver" and that it has to be mastered Ultra Instinct.

Is there any official confirmation or refutation that mastered Ultra Instinct is Super Saiyan Silver?
The answer to your question would be "yes" and "no"! The transformation is called Mastered Ultra Instinct and not Super Saiyan Silver, while the color of Goku's hair is Silver (can be compared to the Super Saiyan God transformation).

Akira Toriyama's original designs for the same have also been released. Also, the designs of new figurines of this Mastered Ultra Instinct transformation have been released. Scans also indicate that Mastered Ultra Instinct Goku is also going to be included in the new DLC for Xenoverse 2.