Yes, but there are two templates called 'SKEL_Human_Skull_A' and 'LOOT_Skull_Human_A' that share the same visual resources, physics, icon and stats. Most of the time the first one is used but a few items have the second template, so they don't stack. 'SKEL_Human_Skull_B' has different resources but shares the icon with the templates above, yeah, so most people won't recognize they are different when organizing their inventory.
