Seems to match up. die clash in front of neck and on rev. This coin has an extra die crack so must be struck later.
Doesn't look like it. Again, match the doubling up first. There are lots of 1945 cents that can have a clash. I honestly don't see the doubling in your photos. There should be noticeable extra thickness on the E of E PLURIBUS UNUM. What is the arrow pointing to in the first pic?
Points to the die marker, looks like a tiny chip. The shadows make mine look a bit off to the left but it is right there. I can't even see the doubling in their photo.
Uh, there is no die chip as a die marker for die 3. If you can't even see the doubling in their photo, then how in the world do you know your coin is 1DR-003???? Once again, just because a coin has die markers, that does not mean that it is from the same die.
That is a carbon spot or stain on the coin. If it was a die marker, it would be noted on the sidebar, and there would be an arrow pointing to it.