Drupal 9: Replace (delete and import) new view programmatically from .yml in an update hook

function mymodule_update_8000(&$sandbox) {
  $message = ''

// Only create if the redirect view doesn't exist and views is enabled.
  $new_view_id = 'YOURVIEWID';
  if (\Drupal::moduleHandler()->moduleExists('views') && !\Drupal\views\Entity\View::load($new_view_id)) {
    $config_path = \Drupal::service('extension.list.module')->getPath('YOURMODULENAME') . '/config/install/views.view.' . $new_view_id .'.yml';
    $data = \Symfony\Component\Yaml\Yaml::parseFile($config_path);
    \Drupal::configFactory()->getEditable('views.view.' . $new_view_id)->setData($data)->save(TRUE);
    $message .= 'The new "' . $new_view_id . '" view has been created.';
  }
  else {
    $message .= 'Not creating the "' . $new_view_id . '" view, since it already exists.';
  }
  return $message;
}

Also see: Drupal 8: Delete view programmatically

Here's a combined example to delete an old view and replace it by a new view from the config/install directory of a module in an install hook:

function mymodule_update_8000(&$sandbox) {
  $message = '';
  $old_view_id = 'YOUROLDVIEWID';
  // Only delete the old view, if it is existing.
  if (\Drupal::moduleHandler()->moduleExists('views') && \Drupal\views\Entity\View::load($old_view_id)) {
    // Delete the old view
    $oldViewConfig = \Drupal::service('config.factory')->getEditable('views.view.' . $old_view_id);
    $oldViewConfig->delete();
    $message .= 'The old "' . $old_view_id . '" view has been deleted.';
  } else {
    $message .= 'Not deleting the old "' . $old_view_id . '" view, since it does not exists.';
  }

  $message .= "\n";

  // Only create if the new view doesn't exist and views is enabled.
  $new_view_id = 'YOURNEWVIEWID';
  if (\Drupal::moduleHandler()->moduleExists('views') && !\Drupal\views\Entity\View::load($new_view_id)) {
    $config_path = \Drupal::service('extension.list.module')->getPath('MODULENAME') . '/config/install/views.view.' . $new_view_id .'.yml';
    $data = \Symfony\Component\Yaml\Yaml::parseFile($config_path);
    \Drupal::configFactory()->getEditable('views.view.' . $new_view_id)->setData($data)->save(TRUE);
    $message .= 'The new "' . $new_view_id . '" view has been created.';
  }
  else {
    $message .= 'Not creating the "' . $new_view_id . '" view, since it already exists.';
  }
  return $message;

}