No. Struts-Tiles is an ancestor of Tiles 2
which grew out of the Struts project. This version is a total redesign
which makes the framework easier to embed within frameworks such as
Struts and Shale.
If you're a casual user, you'll probably only notice the differences
in the tag libraries and in Tiles definition files. Many of them have
been renamed for clarity sake and you can upgrade to Tiles2
by simple doing a global find and replace.
If you're integrating Tiles into a framework or using it for more advanced
features, then you'll probably notice a world of difference. Tiles now runs
as a container which encapsulates it's feature set and there is a much
cleaner API. If you find that this api doesn't suffice for you, please
hop on the developer list and help us flush out the next generation of
Tiles!