Yes, the scales are different for undergrad vs. grad -- and as to which you put, you should ask the FA office at the school.
For instance, mine is listed on the school's website as one of the grad programs (and it does require a BA first, of course). However it doesn't culminate in a Master's degree or MS-level certificate, so for FA purposes it counts as a "fifth-year undergrad" program. The distinction is subtle, and neither is wrong, really. But if I tried to get MS-level fin aid, I would be sorely disappointed.
If it's a program that confers an MS degree at the end, it's a grad program. Otherwise, it's likely not.