Those "dark sap marks" are what's known as mineral streaks, much more

common in maple than cherry. I guess we'll only know for sure after some

stain is slathered on.

Mineral streaks more common in Maple and especially soft Maple but sap marks in Cherry super common. Not the same animal.

That said, support for Maple and Birch now somewhat established by others comments IMHO but if the photo is true in color then the pink = Cherry.