As far as I can tell from the data sheet, Superia Reala does not have a fourth color layer.
It is interesting that the data sheet states that it is only available in 135 format. I have many rolls of Reala 120 in my freezer, and they can be purchased from B&H and Freestyle. I never noticed a difference between the results from 120 and 135 versions, so I assumed they were of the same design. But I guess not, or else they would probably be on the same data sheet.