And which one is this 5.0. Is it the same as 3.0?
SCBCD5.0 is about EJB3.0.
Which one
you should go for ? It depends on your intention. If you don't care about the old EJB2.0, you should skip it. But if you're interested to know more about them, before getting into the new EJB3.0, then go for it.
Note that there aren't any books aimed specifically at SCBCD5.0 yet.