The first mine has the position ID 1015 0101 (0x01011015) in the save file. The second one has 2C15 0101. The difference between them is 1C, which is exactly the difference between them in bytes in the path file, which means position ID is some kind of an offset.
So far, given a Path file without any previous information, we could parse the screen array and the collision map (although we don't know where it ends). I believe the next step is to find the delimiter for the collision map.
Edit: Figured it out! The last short in the collision mask structure is mostly random, but when it's 6400, it means "end". Right after that comes your list, in your format. You can see five Muds over there (And the LCD sign, which also includes its position and other data btw, and the ledges.)!
This is screen MIP1C36 BTW, the topmost and leftmost screen in the path.