  Building on work by Hang and He, we show how the residual five-dimensional
diffeomorphism symmetries of compactified gravitational theories with a warped
extra dimension imply Equivalence theorems which ensure that the scattering
amplitudes of helicity-0 and helicity-1 spin-2 Kaluza-Klein states equal (to
leading order in scattering energy) those of the corresponding Goldstone bosons
present in the `t-Hooft-Feynman gauge. We derive a set of Ward identities that
lead to a transparent power-counting of the scattering amplitudes involving
spin-2 Kaluza-Klein states. We explicitly calculate these amplitudes in terms
of the Goldstone bosons in the Randall-Sundrum model, check the correspondence
to previous unitary-gauge computations, and demonstrate the efficacy of
`t-Hooft-Feynman gauge for accurately computing amplitudes for scattering of
the spin-2 states both among themselves and with matter. Power-counting for the
Goldstone boson interactions establishes that the scattering amplitudes grow no
faster than $O(s)$, explaining the origin of the behavior previously shown to
arise from intricate cancellations between different contributions to these
scattering amplitudes in unitary gauge. We describe how our results apply to
more general warped geometries, including models with a stabilized extra
dimension. In an appendix we explicitly identify the symmetry algebra of the
residual 5D diffeomorphisms of a Randall-Sundrum extra-dimensional theory.
