Thanks you, also is he the same Ben 10,000 from what we saw in the original series (from Ken 10 episode) or is he another 3rd future of omniverse Ben?

Yes, ma'dam I can see it 😁.

@mcdufferton.bsky.social would it be consider giant production error or alternate universe?

Yeah, Looking back at Ken 10 episode, OS Kevin 11K design is kinda reminds me of Van Keniss from Generator Rex.

His design is look like Kevin 11,000 from Original Series.