I was looking for April data (no updates yet), but I've seen that the Switch platform-specific page has been actualized (previosuly it showed no numbers, probably because there were less than 10 retail SKU available... The list includes digital sales now...
The 4th game is a big surprise... but we all know that Spain loves Just Dance!
1 12 + THE LEGEND OF ZELDA: BREATH OF THE WILD
2 12 + 1-2 SWITCH
3 12 + THE LEGEND OF ZELDA: BREATH OF THE WILD - LIMITED EDITION
4 3 + JUST DANCE 2017
5 7 + SUPER BOMBERMAN R
6 7 + SKYLANDERS IMAGINATORS + STARTER PACK
7 3 + SNIPPERCLIPS ¡A RECORTAR EN COMPAÑIA! (DIGITAL DOWNLOAD)
8 12 + THE LEGEND OF ZELDA: BREATH OF THE WILD (DIGITAL DOWNLOAD)
9 7 + 1-2 SWITCH (DIGITAL DOWNLOAD)
EDIT: Remember that the numbers which showed Bomberman selling 2,200 units and Just Dance 1,600 were from the 10th week of the year (6th-12th March?), while this chart is for March, so maybe Just Dance has outsold it after the first week... Also, not sure about how have they measured the digital sales... maybe they've just added the eshop best sellers at the bottom of the list (again, I have no idea).