nope, it is not. With the typehint available in master, you must use a ``Behat\Mink\Driver\Goutte\Client``. The constructor will not accept passing a ``Goutte\Client`` directly.
However, the reason to extend Goutte is not relevant anymore  when using an uptodate version of Symfony DomCrawler (the feature has been merged upstream), so it makes sense to allow usign teh unmodified Goutte (in v2 of Mink, I will drop the extended client entirely)