Tome of Magic: Mystery version of Shadow Evocation

[Shin Okada]

Shadow Evocation Mystery in Tome of Magic P.149 says,

This mystery functions like the spell shadow evocation, except as noted above. In addition, this mystery can mimic an evocation spell of lower than 5th level (rather than 6th).

And the original spell version of Shadow Evocation,

You tap energy from the Plane of Shadow to cast a quasi-real, illusory version of a sorcerer or wizard evocation spell of 4th level or lower. (For a spell with more than one level, use the best one applicable to you.)

So, it seems that both the mystery version and the spell version mimic an evocation spell of 4th level or lower. If so, what was the intention of the second sentence of mystery version? Am I missing something?

 

[Rabulias]

Spells like cacophonic shield (SC p. 41). It's Bard 4, Sorcerer/Wizard 5. So if you are a Bard, you can create a shadow evocation version of the spell, but a Wizard could not.