Nooot really. The game
doesn't
have anything to do with Oriental Adventures. Wick might have thought about it, and almost certainly had seen it, but it has no significant lineal ties, and suggesting L5R "has something to do with" Oriental Adventures paints a confusing and deceptive picture for somebody who doesn't understand the context. Rokugan is far,
far
closer to the imaginary world of Fantasy Sengoku Japan used in Bushido being a single nation populated mostly by humans, and instead of creating a D&D-equivalent of the majority of races and kingdoms like Kara Tur basically was with its four or five nations and korobokuru and hengeyokai, etc.
Especially since the original question was:
I gather it came out of the original D&D Oriental Adventures, so as a setting it's pretty old.
In that context, no, L5R didn't have anything to do with Oriental Adventures. Trying to list everything that potentially inspired something is pointless. You could say "I gather Metallica came out of the original spirituals of former slaves in the Reconstruction Deep South" and you'd be semantically correct but might give somebody a fairly worthless idea of the lineage of early-80s thrash metal music.
Remember, semantics aren't always valuable.