I think openai looks pretty bad right now, especially with the "her" tweet, but I can't honestly say these voices sound similar. The her clip is so iconically scarjo and I don't think the sky voice is even that close. I'm not a voice expert and I dont know all the technical terms but it isn't very similar in tone, cadence, or what I want to call texture (?)

I wanted to laugh at and belittle openai when I first saw scarjos claim that her friends and family couldn't tell the difference but from the samples you just linked I find that so unlikely that I think she is lying.