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Because it uses the same Naschorn engine, there is no difference. The list builds automatically based on engine class. 

Hello!
May I ask if there is any difference in writing between these two scripts when they are used

Because this is hardcoded in Java Library (naming of languages, supported by it), where IBM has not so much impact

Everything Andrey has stated is correct, but be aware that using "Nashorn" or "nashorn" as the language may be problematic in the future as Nashorn has been deprecated and removed from Java in 15 and is being removed from the next release of Manage which will upgrade its Java version. I have heard it is being replaced with Graal (https://www.graalvm.org/latest/reference-manual/js/) but I don't think anything has been officially announced.

Thank you for the correction, it was just mistyping ) 

But, I think there will be not much difference between Nashorn and Graal from JS code point of view. Nashorn is pretty limited, so I do not see anything, that was written for Nashorn, that will not work with Graal.

But we all remember how it was with moving from rhyno to Nashorn....