Difference between Corpse Party and Book of Shadows?

When I was searching for Corpse Party in the Playstation Store, I came across two different games / versions, but I do not know the differences

All I've found so far is that there are a few "what if?" So "what if" should be moments but that is a little too vague

So I wanted to ask you, what are the differences between these two games / versions and which version does this Youtuber play?

With corpse party: Book of Shadows appeared in September 2011 in the Japanese market, a sequel to Corpse Party: Blood Covered for the PSP; a release in North America followed in 2013.https://de.wikipedia.org/...rpse_Party" class="text-primary">https://de.wikipedia.org/...rpse_Party" class="text-primary">https://de.wikipedia.org/...rpse_Party" class="text-primary">https://de.wikipedia.org/...rpse_Party # cite_note-7 With Corpse Party: Hysteric Birthday 2 U followed in 2012 by a https://de.wikipedia.org/...r_(Medien) for the PSP in Japan, which will be released in the western Windows market in winter 2018.https://de.wikipedia.org/wiki/Corpse_Party # cite_note-8 https://de.wikipedia.org/wiki/Corpse_Party # cite_note-9 Corpse Party: Blood Drive, the third installment of the Corpse Party series was released in Japan in 2014 for the

https://de.wikipedia.org/...ation_Vita https://de.wikipedia.org/wiki/Corpse_Party # cite_note-10 https://de.wikipedia.org/wiki/Corpse_Party # cite_note-11,

https://de.wikipedia.org/wiki/Corpse_Party

Do you happen to know which version of this Youtuber is playing?

Nope.