Trilogy doesn't work in Leopard or Snow Leopard on an Intel mac, so it has been off of my plate for a while.
Trilium does include all of the Trilogy sounds, so I think you could reconstruct any old patches.
My opinion is that you wouldn't want to because the new sounds are much more detailed and tweakable.
It seems like an HD version of Trilogy, with a million new features and sounds.
Sonically, it continues to amaze me.
My hat is off to Spectrasonics.