Black Clover manga chapter 309 reveals that Yuno actually possesses star magic. He shows new moves with his second grimoire.. Yuno receives his second grimoire as seen in the Black Clover manga (Image via Shueisha) As mentioned earlier, Yuno's grimoires can be attributed to his soul and lineage.
Similarly, if Yuno souls would "switch," they are so much the same that it wouldn't make any difference physically or mentally. This means that it doesn't make any difference to the first grimoire who chose him but this also means that another grimoire can choose him because there's still another soul with no grimoire within him.. Yuno didn't get his second grimoire before he got to Spade kingdom because he's originally from Spade kingdom and needed to visit Spade's grimoire tower in order to receive it.