  This work deals with the presence of twinlike models in scalar field
theories. We show how to build distinct scalar field theories having the same
extended solution, with the same energy density and the very same linear
stability. Here, however, we start from a given but generalized scalar field
theory, and we construct the corresponding twin model, which also engenders
generalized dynamics. We investigate how the twinlike models arise in flat and
in curved spacetime. In the curved spacetime, we consider a braneword model
with the warp factor controlling the spacetime geometry with a single extra
dimension of infinite extent. In particular, we study linear stability in the
flat and curved spacetime, and in the case of curved spacetime, in both the
gravity and the scalar field sectors, for the two braneworld models.
