Are SCJP 6 and OCJP both same?

Are both SCJP 6 and OCJP 6 exams same? I am going to write OCJP 6 exam this month end but I am preparing SCJP 6 book by Kathy Seirra.

And for practice I am preparing Kathy seirra's "OCP Java SE 6 programmer study guide". is it ok?

I am confusing with this words "SCJP 6" , "OCJP 6", "OCP Java SE 6 Programmer". Are those same?

If same why these many different names?

Thank you in advance? please guide me .