It really boils down to the particular card. In general, I agree BVG will generally be 1 grade easier than SGC but it is far from linear. There's a good guy I did a deal with on the bst board who successfully crossed a 48 Leaf Ted Williams BVG 2 to an SGC 2. I wasn't surprised because it looked like a legit 2 in any holder. Generally speaking, I suspect it's easier to cross lower grade cards successfully. As you get into the upper echelons, where the gap might be highest is in that 6-8 range. A BVG in this ballpark is probably going to be tougher to cross.
But as I started to say in the beginning, it mostly depends on the specific card.
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