Is the tree in To Kill a Mockingbird that Scout and Jem find the presents in the same tree as the one near the school house where Ewell dies?
This is an EXCELLENT question and one I had never considered before. Upon a second and third reading of the two sections (Chapters 4 and 28), I believe it probably is. In Chapter 4, Scout tells us that
... as I raced by... Two live oaks stood at the edge of the Radley lot; their roots reached out into the side-road and made it bumpy.
In Chapter 28, we know Jem and Scout passed the same trees on the way to the school. On their return trip, Jem tells Scout that
"... we're almost to the tree now. Few yards from that an' we'll be to the road. We can see the street light then."
Jem's identification of "the tree" (instead of possible "a tree") does seem to signify that it is the same tree in which the children received their presents from Boo. It would make sense that if Boo knew the children were out at night (and he may have been watching, or known about the Halloween pageant), then he may also have been near their special tree.
Thanks for the great question. It's one that only Harper Lee knows for sure.