Can the AC Adaptor 20V 4A can be used with Lenovo X12-51823?

As 20v voltage seems to be used by all lenovo models.
The 4A must be a match or greater that the original.

Example if the original is 3.4A the new charger will be fine, if the original is 4.5A then you are would be overloading the new one (Not good).