Decide whether the graphs \(G_1 = (V_1, E_1)\) and \(G_2 = (V_2, E_2)\) are equal or isomorphic.

\(V_1 = \{a,b,c,d\}\text{,}\) \(E_1 = \{\{a,b\}, \{a,c\}, \{a,d\}, \{c,d\}\}\)

\(V_2 = \{a,b,c,d\}\text{,}\) \(E_2 = \{\{a,b\}, \{a,c\}, \{b,c\}, \{c,d\}\}\)