olsingleshot,
From what I can see, the main differences are: The Super Varmint comes with a Picatinny Rail, has an Adjustable Cheek Piece, and the receiver and barrel are Stainless Steel. The Varmint has blued metal and has a high comb stock, and can be outfitted with an accessory Picatinny Rail.
The Varmint is available in left-handed versions where the Super Varmint is not.
I also noticed recently that the Beretta/Tikka website no longer offers the Super Varmint in the USA. But you could probably still get one off the auction sites or maybe from a dealer who still has one in stock.