They are the same band, first named STALAGGH, then later renamed to GULAGGH, with 3 albums released, here is their backstory
"Stalaggh came into its futile existence around 2000, when members of the Dutch and Belgian black metal and ambient music scenes came together for the express purpose of making an album that would fill their listeners with despair. To help achieve that goal, they dispensed with the usual growling black metal singers and instead brought in mental patients. Apparently one of the non-crazy (relatively speaking) members of the band works in an insane asylum and was able to get permission to work with some of the patients, under the guise of it being primal scream therapy. Allegedly, among the many ?vocalists the band has worked with in this way is a guy who was institutionalized for killing his mother by stabbing her 30 times."