I never found them to be the same.
Yes I know that almost all had moments of breaking down, but at the same time they were all so different or felt different cuz of the reasons, but of course, it all came from the same root, the zodiac curse.
There are really only so many ways you can show a way a person breaks down and besides they all had their stories to tell and even with the manga complete not all of them were told in the series such as the relationship of Ayame and Mine. Takaya-san wanted people to get more of a feel for this couple and how they met, but she never was able to include it in the series.
But what I find more important is how the characters deal with getting over their troubles and moving on and looking towards the future, which is hard to do since they are bond by the curse.
Life is filled with good memories and bad ones, but memories are what you make of them.