There is no exact equivalent. There are some older threads on this you might find using the search, but the bottom line is you'll just have to try one and hope for the best. I personally suggest you try a store's own brand (i.e. Walmart, Target, Safeway) before buying name brand. Formula is a good deal more expensive here and if you're here 2 months, that adds up.
Both my sons were SMA babies and did just fine on Walmart's formulas.