As opposed to looking for "equivalent model" it's best to understand the requirements that need to be fulfilled and choose the correct model based on that.
Comparing datasheet numbers can only go so far as different vendors have different ways of measuring performance.
This includes both "ideal condition" and "real world" numbers.
Also, different mix of required features might not be represented on the various datasheets.
This was the primary motivation for creating the Appliance Sizing Tool referenced earlier, to provide guidance in a variety of situations.
For fine tuning the recommendations that come from the AST, it's always best to check with your local SE.
