What differs is the training methodology - not the Aikido.
That can only be true when you define aikido broad enough so that only the goal matters, not the means to achieve the goal. Or put differently, so that only the destination matters, not the road you took to get there. The problem with such a broad definition is that you'll have to include certain activities that are most definitely not aikido, precisely because of that broadness.
Anyhow, if it isn't your training methodology that defines your aikido, then what does?