The difference between firstOrCreate and updateOrCreate

public function firstOrCreate(array $attributes, array $values = [])
{

    if (! is_null($instance = $this->where($attributes)->first())) {
        return $instance;
    }

    /**
     * @var $instance \Illuminate\Database\Eloquent\Model
     */
    $instance = $this->model->newInstance($attributes + $values)->setConnection('mysql');
    $instance->save();
    
    return $instance;
}


public function updateOrCreate(array $attributes, array $values = [])
{
    if (! is_null($instance = $this->where($attributes)->first())) {
        return $instance;
    }

    $instance = $this->model->newInstance($attributes)->setConnection('mysql');
    $instance->fill($values)->save();

    return $instance;
}

I looked at them. They were actually like this. Do they actually differ if updateOrCreate can override the parameters set above? for instance:

$user = User::firstOrCreate(['uuid' => '12345', 'name' => 'david'], ['name' => 'summer']);

$user = User::updateOrcreate(['uuid' => '12345', 'name' => 'david'], ['name' => 'summer']);

These are the differences I think they are, so what are the actual differences?