/give Command

For getting Log there are two Commands: /give @p log or /give @p log2. When you use log and set the data (ID) to 0 you get Oakwood and with ID 1 Sprucewood. With log2 ID 0 is Acaciawood. Wy are there two Commands? For stairs there is a single Command for each log, for fencegates to and for fences it's the same like log. Please fix!