"So Perfect (Single Version)" largely corresponds to the standard version, but instead contains a Casper and a Marteria-verse two stanzas of Casper. That should then correspond to the video version.
Besides "So Perfect" are "all prohibitions" and "Rock'n'Roll" by Casper and Marteria.
"Unbelievable" is a kind of continuation of "Casper BUMAYE" is treated and Benjamin Griffeys life as Casper, exactly like the catchy "Good morning heart attack" and also very personal "radar".
These three songs fit musically and lyrically not the album that decision, in the form of a stylish digipack nachzuliefern single is thus not a pure commercialism.
The two remixes are again a nice cherry on top, especially since I would rate the "Jack Beauregard Remix" even as excellent.
Conclusion: @ All Casper fans: Buy!
mfG Martin