Only a true Botanist can differentiate between these three plants:
Virginia Creeper
Virginia Creeper generally has four or five leaves but sometimes may have only three. Some juvenile plants have only three leaves. One noticeable difference between Poison Ivy and Virginia Creeper, if you’re willing to get close enough to look, is that the vine of Virginia Creeper is woody. The wood-like vine has simple tendrils that hold the plant to its ‘host’. The Virginia Creepers climbs up or along other plants, brush, trees, or supports nearby. Deep blue berries can be found on Virginia Creeper’s during the fall.
Poison Ivy
Poison Ivy will always have three leaves. Its leaf pattern will always be the same; center leaf stem being longer than the other two and greater in size. During the fall, Poison Ivy develops and drops greenish-white berries. And of course, Poison Ivy is known for its itchy red rash caused on the skin after coming in contact with the plant. [Source]
This is a very useful article on this topic:
Boston Ivy Vs Virginia Creeper
Happy Steeming!