Question about Bosch Hausgeräte Unlimited 8 All

With the BSS, pretty much all the accessories are included. With the BKS "only" the basic equipment, but here a slightly wider floor nozzle (more led's, because wider). The hoover itself is identical. However, the battery should also be taken into account. The BSS comes with a 5 Ah battery. The BKS may have a smaller one (4 Ah?) but I'm not sure. lg