CCK field widget?

here's a code snipit to modify a review node to a cck node, providing that you've defined it with the same fields:

$node = node_load(array('nid'=>$nid, 'type'=>'review'));
if ($node) {
  $node->type = 'content_review';
  $node->field_description[0] = array(
    'value' => $node->body,
    'format' => $node->format,
  );
  $node->field_rating[0] = array(
    'value' => $node->review_rating,
  );
  node_save($node);
}

little fuller example:

$result = db_query("SELECT nid FROM {node} WHERE type = 'review'");
while ($o = db_fetch_object($result)) {
  $node = node_load($o->nid);
  if ($node) {
    $node->type = 'content_review';
    $node->field_description[0] = array(
      'value' => $node->body,
      'format' => $node->format,
    );
    $node->field_rating[0] = array(
      'value' => $node->review_rating,
    );
    node_save($node);
  }
  print "$node->title<br>";
}

that code is something you'd only need to run once. you could install the devel module, enable the php evaluation block, run that type of code (you'll probably need to tweak it depending on where the data is going), and then when you're finished uninstall the devel module.