Typically the differance is the sendero is the magnums and the vssf is the standard calibers. Ie: 7mm RM, 300 WM, 300 SAUM ect... vs the 243, 308 ect...
I have one of each. They are the same gun other than some of the notable differences such as the difference in action size. The stock is the same on both other than the Sendero's is slightly longer to accomodate the longer action. It also feels a bit beefier through the grip area. Lastly, a Sendero comes with more of a recoil pad than the VS. It's a nice pad too. I'm not sure who makes it.