All three arguments try to establish the same conclusion -- you've got
that right. They are different because each gives different reasons
for that conclusion. For instance, the Relativity of Distinctions
argues from the fact that the importance of distinctions is
perspective-relative. The other arguments don't mention importance of
distinctions. The Many Appearances argument focuses on appearances
being different from different perspectives; the other two arguments
don't mention this. So: same conclusion, different reasons.