Are these chokeberries?

Another plant id question.
Leaves
Berries
I have a SAS survivial hand book and the description says spear-shaped, finely toothed leaves five petaled pinkish or white flowers my bush has no flowers right now dry woody areas it is red , purplish or black spherical berries which grow in clusters. To me, that sounds a whole lot like what I have here. The thing that concerns me is the last line “do not confuse with the poisonous buckthorns”