While the goals are similar, this test uses a different scoring system focused on modern agile teams. The boundaries between roles are more fluid here, and initiative and adaptability are valued more than the strict hierarchy suggested in the classic model.
Yes. A team role is a behavioral strategy, not a fixed personality trait. In one group, you might take on leadership, while in a group of strong experts, you might prefer the role of a doer.
This can lead to a conflict of interest or duplication of functions. The solution is a clear division of responsibilities, or one participant consciously shifting to an adjacent role the team currently needs for balance.