From the looks of the forearm, the TR and thumbhole are the same in height and thickness. It would come down to your choice of having your thumb through a hole or over the stock. Look at the picture below. I took the two different models and place them exactly over each other.

BTVS overlayed on TR
[img width=600 height=115]http://i168.photobucket.com/albums/u184/AzizaVFR/BangToys/BTVS_TR_stocks.jpg[/img]

You will note the thumbhole is just a little bit longer, a slight higher cheek area, along with a more forward sweep and smaller hand grip area. They are the same length of pull. Now you have to decide since you know how the original FVT stock fits you, here are a couple of overlays showing the FVT in the background with the BTVS/TR on top of it. Think about what fits you well now, and the areas you want to change/improve.

[img width=600 height=277]http://i168.photobucket.com/albums/u184/AzizaVFR/BangToys/BTVS_TR_stocks1.jpg[/img]