Sure, there's a similarity. I can buy that Taurus inspired Stairway. But it's hardly the note-for-note ripoff that California makes it out to be. Not enough to hold up in court about a half century later.
Randy California has been dead for over 15 years. Even though he thought Led Zeppelin ripped him off and should have thrown a little money his way, he never sued them. It's the executors of his estate who are suing.