The ordinary Tiger had a hole in its mantlet for an MG to fire through. But the "Command" Tiger had no such MG in its turret. Therefore its mantlet was supposed to have no hole.
The factories would cast a "Command" mantlet from the same pattern as a standard mantlet, but with a plug blocking the hole. In some cases it appears that they converted an existing standard mantlet by welding a metal plug into the hole. In both cases, they tried to make the plug completely invisible, its surface flush with the mantlet. This is an example of a Command mantlet; the location of the plug is indicated.
This kit provides a plug, part B38, so that you can convert any one of its mantlets to the Command type. But there seems to be a problem with part B38. Either it doesn't fit, or it needs to be pushed hard in. On this kit, the plug has not been fully inserted. You may have to file around part B38 to reduce its diameter. In any case, it has a strange indented lip that doesn't resemble the real item.