Here is the one from the LT1 on BaT.

I am far from an expert but this looks a lot different, especially the “k”. What say you?

IMO, the CTK was restamped. By who or when, I don't know. I think the V0615 is original. No other proof of being a real LT-1.

The T and K in that pad stamping look to be altered

I would agree, the "T" and "K" have been altered or re-stamped with possible broach marks re-done under them. The marks look different under the "V". Also, you can see the metal is raised around the outside of the letters from the stamping process, but on the right side of the "C", it is flat, where the deck was re-sanded or machined to add the "T" and "K".

Stamp
 

I think it's legit. Just a bounce strike imo. Hit harder left to right and top to bottom. Broach marks seem good. The mark on the lower right of the "K"? ... who knows. Was it hit in that exact spot when doing the water pump? Did someone "enhance it" with a screwdriver and a hammer? Regardless, my money would be on authentic. Unfortunately it will soon be out of my price range. As strange as it may seem, I was pretty concerned about the seats. Why did they end up there?

I think the stamp is questionable. The 06 on the BAT car are different than what Tim posted and the deep broach marks dont look like factory to me.