not sure about the entire control arm, but you can replace the bushings with the TT bushings, which are available at ECS Tuning. not sure if this works for the 2.0 bug control arms, but it works with the 1.8t.
I think all of the Lower Control Arms (LCA) were basically the same on the beetle.
I don't know if Audi TT arms will fit but you can replace the Beetle bushings with the TT bushings for a better / tighter feel.
Some parts houses sell the LCA's with the TT bushings installed, I know MJM does. MJM Autohaus