Both seem very similar.

But the rg320 has an edge 3, isnt that a better trem than the lo-trs?
The only thing thats very similar about those are that both are made out of cheap material and the knife edges are questionable. One more thing that is similar is that both are swappable to an OFR/similar bridge but with the RG450, slight modification needed.
"Play with your ears" - Yngwie Malmsteen, Paul Gilbert
Thats what she said...