Yes a SX or "red head" tripple, non powervalve, complete 600 top end will fit on a "red head" tripple, non powervalve, 700 bottom end. The cases + crank are the same.
X2 on what slide show bob said. Stay with the 600 carbs though as 700s are a tm33 where as 600 are tm 31. They look almost identical from my experience