You may be surprised - not only not the same species, but two unrelated beetles! (if possible, seperate images of each observation)
pic 1, 4+5: Aegithus cf. meridionalis (Erotylidae)
pic 2+3: Corynomalus sp. (Endomychidae)
Both (unrelated) Fungus beetle families are known for chemical defense, and similarity here is best interpreted as Muellerian mimicry.
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