I came across:
Are they the same thing? Are these capable of sending POST requests to an external API?
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As you might already figured out, yes its the same and yes thats the way it works...
As described in the manual:
use Joomla\Http\HttpFactory; // Create an instance of a default Http object. $http = Http\HttpFactory::getHttp(); // Prepare the update data. $data = array('make' => 'Holden', model => 'EJ-Special'); // Invoke the GET request. $response = $http->post('http://api.example.com/cars/1', $data);