So questions is-
-Are all merit sources have same smerit generation?
According to this reply from @hugeblack, they are not the same. Each merit source received a different amount of merit on a monthly basis.
Most Merit sources[1] came with an average of less than 300 sMerit per month, there are about 5-6 with around 1000 sMerit, and the rest are between 250 and 100 or less, some of them are inactive or active in local baords.