The graphs have different cycle lengths. So can they be considered as not isomorphic?
An isomorphism would map a cycle to a cycle of the same length, so the fact that one graph has triangles ($3$-cycles) and the other one doesn't implies that the graphs are not isomorphic.
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An isomorphism would map a cycle to a cycle of the same length, so the fact that one graph has triangles ($3$-cycles) and the other one doesn't implies that the graphs are not isomorphic.