Is there any paper, technical report, etc. that compare ATL and ETL in more details? Including their syntax and preferably their metamodel element mapping.
For example, I want to know what is the equivalent of Matched Rule (and lazy matched rule) and InModels of ATL metamodel in ETL metamodel?
I'm not aware of such a paper I'm afraid. In general, you're more likely to receive helpful answers for any questions related to ETL's metamodel in Haetae by opening an issue in the project's GitHub repo.