Is it possible to somehow get if there is an entity instance of the template and which one exactly?
(not instantiate(), just placed on scene)
There is not.
In editor, you can check the References after right click the template asset. If you mean runtime, I think you need to write your own script like give them ids or key/value pair to manage them.
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Right. However, I think the OP means the templates that you drag and drop in the Editor. At runtime they become normal entities and you cannot know if they were instantiated from a template.