Surely you realize that the same result does not mean that the process leading to the conclusion was the same.

Even if the processes were identical, using an LLM arguably likely broke any privilege and confidentiality protections you might previously have enjoyed. See, e.g., United States v. Heppner (S.D.N.Y.) (recent case of first impression).

So there's that.

I was also going to comment separately that LLMs have been great to identify opposing counsel whom I suspected of not litigating in good faith / actually reading the cases and applying them. Now the confabulated cases are proof positive!