The source that identified them as GLSDB is a good one so I trust that's true.
I tried to find information on whether the SDB has the additional tungsten balls in the warhead but I couldn't find any source indicating it did, as compared to the M30A1 GMLRS Alternative Warhead where this information is easily found. The only things I found describe it as having a tungsten casing as the source of the fragments. There is an SDB variant with a carbon fiber casing that does not have the fragmentation effect and is meant to have a smaller radius of damage for more localized effect (the FLM variant).
The SDBs do have less explosive than the GMLRS warhead. 16kg versus 24.5kg.
I tried to find information on whether the SDB has the additional tungsten balls in the warhead but I couldn't find any source indicating it did, as compared to the M30A1 GMLRS Alternative Warhead where this information is easily found. The only things I found describe it as having a tungsten casing as the source of the fragments. There is an SDB variant with a carbon fiber casing that does not have the fragmentation effect and is meant to have a smaller radius of damage for more localized effect (the FLM variant).
The SDBs do have less explosive than the GMLRS warhead. 16kg versus 24.5kg.