It's the same shrimp. M. banjarae is a misspelling of M. banjare which is the older name under which the Pearl Shrimp was identified. Recently a friend of mine in Austria, who has been identifying almost all the shrimp in the hobby for years along with another friend of mine from Germany (both of whom has been, by the way, making the scientific names of all of these shrimp available to the hobby) identified the pearl shrimp as belonging to the Macrobrachium mirabile species complex.
Scientific names for shrimp species in the hobby can change as new information becomes available. The difficulty in identifying our shrimp species is that many have not been scientifically described or the descriptions are from *literally* a hundred years ago and no new work has been done on them yet. So, it's normal to see revisions of scientific names once in a while.