It's highly unlikely that the EU decision would alter the outcome of Oracle v. Google in any way regardless of timing. This is a US case involving completely different parties and a significantly different set of facts.

Decisions of non-US courts usually have little influence unless statutory or case law is severely lacking or highly ambiguous, and even then they are treated much like one might treat a book by a legal scholar. Decisions by courts that do not share the English common law traditions are of even more attenuated influence.