Is every Roman Catholic Church saint also an Eastern Catholic Church saint (and viceversa)?

I was recently reading about [Isaac the Syrian](https://en.wikipedia.org/wiki/Isaac_of_Nineveh) . I learned that he is considered a Saint in the Eastern Catholic Church (EC), but, it seems, not in the Latin Catholic Church (LC). He is not listed [here](https://en.wikipedia.org/wiki/List_of_Catholic_saints) , and he does not have a YES in [this list](https://en.wikipedia.org/wiki/List_of_saints) either. Actually, from the latter, you can see that a lot of saints in the EC are not saints in the LC, and _vice versa_. So, if this is really the case, why is it? I could imagine this disparity **does not mean disagreement** about the merits of sainthood, but rather a type of specific tradition or relevance to the respective church. In effect, many LC-only saints were "members" of the now called LC (for example, [Rose of Lima](https://en.wikipedia.org/wiki/Rose_of_Lima) , from Peru), whereas many EC-only saints were "members" of the now called Orthodox Church (for example, [Clement of Ohrid](https://en.wikipedia.org/wiki/Clement_of_Ohrid) , from now Bulgaria).