FIFA World Cup Russia 2018 Sticker Collection
Panini / Coca Cola
Austria / Switzerland
There are 12 extra stickers available in Austria and Switzerland and the two sets are slightly different, though it seems that Carlos Valderrama and Miroslav Klose aren't readily available in Austria yet.
UPDATE (14-05-2018 19:46): Wila75 has provided scans from the album showing that the Carlos Valderrama and Miroslav Klose will be available from McDonalds later this month. Both stickers are a different size compared to the Coca Cola stickers - wider and taller.