Get the score for each. Look through it. Look through it while listening to a performance of it. Sit at the piano and dabble your way through it.
For each piece you will be able to identify sections which:
a) look perfectly manageable. You know how to do them.
b) look like a pain. You've done something like them before, but aren't comfortable. You know how to go about learning them.
c) Use a technique you've never done before. You aren't sure what's involved.
When you've done that, look through the etudes and see what ones deal with anything (c) - you should do them. Any that deal with (b) you may do, or you could simply learn them in the piece. Up to you. Anything (a) is probably a waste of your time at this point - though you may find them beneficial generally.
Yes, I know I haven't answered the question you asked. I answered the one you should have.