Standardized unexpected earnings(SUE), what is it really?

For some reason, the definition of SUE given by the CFA level II curriculum is completely different from the definition given elsewhere.

In CFA we have SUE = UE at t / standard deviation of past UEs in a period of time
Anywhere else the definition is SUE = UE at t / standard deviation of expected EPSs at t

Like this one:

Which one is correct?

Whose exam are you taking?

Okay…fair enough