i know there was a thread on this before, and 1 member was going to or had purchased a VT switch, but never heard from them..
the VT switch is larger than the VS switch, so the hole must be modified to fit it. as far as the plug compatibility, im not 100% sure. this is one mod i will try in the next coming weeks as im ready to install my fog lights. i have a spare dash surround at home that im modifying to fit the fog light switch, and will be purchasing a VT switch soon.
if it all goes to plan, if i get it working, i will do a write up for the how-to section.
do you have a vt switch block or just inquiring at this stage?
EDIT: found the link
Vt-Vx Headlight Switch to VR/VS