Retool

A retool is a newer version of an existing toy which has had parts either added, removed, or resculpted. This can be as simple as changing a single part to provide stability or ease of transformation, to altering a large percentage of the toy's appearance or gimmickry.... In rare cases, extensive remolding even changes some aspects of a toy's transformation.

From Teletraan I: The Transformers Wiki, a Wikia wiki.