They don`t appear as re-entry marks to me. The mark in ND may be an Engraving slip or scratch.
I find that Newfoundland stamps do have alot of extra ink or a slightly messy image more often than stamps from Canada.
But it is a great area to explore for new re-entries. The ground here has just been broken in the last couple of years.
Here is one that I found recently that appears to be a new re-entry on Scott 135.

and this is another possible I found on Scott 139:
