I've looked at the parts charts of the 150 and the 175. Both have 3 tip sizes to keep up with. The 150 parts chart looks like its tip (50-0391, 92 & 93) is extremely tiny compared to the 175 (41-003, 04 & 05). When it comes to keeping up with 3 tip assemblies for one brush, I think bigger is better. I haven't seen these tips in real life, so I don't know.
It shows that with the Crescendo 175, the medium tip 41-004 is the same tip as the Anthem. I wonder if the two other Crescendo head assemblies will work in an Anthem.