There is a difference in the sanyasa dharma for the heads of the mutts such as sankaracharyas and various other mutts with an established parampara. They are the upholders of dharma. They have many worldly responsibilites.Their presence in the samsara is not for enjoyment but for the execution of the responsbilities entrusted to them. In their absence there will not be any interpreters of dharma and religion will disintegrate and disappear.
Sanyasa is only auxillary to their responsbilities as heads of the mutts so that their actions are selfless and pure. They are karmayogis.