Avoid duplicate posts when importing different files with common IDs

I have to import different files that share a data structure.

In some files the same ids are present, but instead of updating the already existing posts due to the first import, subsequent imports of repeated ids create new posts instead of updating.

Each file can have new and repeated ids and I expected new posts to be created for the first case, and updated in the second, but new repeated posts are always created, is there any way to fix this?

Thanks