Are clonazepam, lorazepam, triazolam the same drug?

Not same group. All are sedatives but are different; clonazepam (klonopin) is long-acting benzodiazepine for anxiety @12 hours). Lorazepam (ativan) is short-acting benzodiazepine for anxiety (4-6 hours). Triazolam (halcion) is hypnotic for insomnia & is short-acting.
No. No they are not the same drug but belong to the same drug class called benzodiazpines. This class is used to treat anxiety and insomnia. They also can be used to treat seizures.