Traditionally, Cat skulls have been used as a symbol of death and decay, and these are the usual ideas when we see a skeleton tattoo is to induce a skull tattoo on a person's body. However, this is not the only meaning of a skeleton tattoo.
Tattoos are particularly interesting because they sometimes mean very different things. The meaning of the Cat skull tattoo can represent a reminder to give full play to its life as death will eventually come. So for this reason, a lot of people choose to get a skeleton tattoo to show the changes they've made in their lives.
Source: @aleahbpc