I've played on both tables quite a bit... Had a Shelti in the house, and played Tornado DYPs, tournaments etc... I no longer own the Shelti, I remember the differences clearly.
The main difference between the two tables is grip. When transitioning to Tornado, your brush passes have to be set further back, your rocking in a pin position has to travel less (or you'll squirt the ball out), you have to be a little more precise in your pin position (or the ball will squirt out), and you'll have to absorb your stick passes a little better.
The side profile of the Shelti foot is thinner, but the front face is wider. This means that tic tacs are harder to do on a Shelti, but connecting shots is a little more forgiving. I have no advice except for be consistent in your shot execution on both tables, and you'll be fine. If you can do fast tic tacs on a Shelti, you'll be laughing on Tor.
Main Advice: Play on your Shelti with Tornado balls, the balls are quite different.
Edit:
Who told you snake shots were difficult to learn on Shelti? If anything they're easier to do than on Tornado.