Are all antibiotics the same?

No. Not at all. Each antibiotic has a unique spectrum of activity, side effect profile, cost, interaction with other meds, dosing, etc. Antibiotics are generally chosen carefully to suit the host and the infection.
No. Each antibiotic has its own spectrum of activity, which bacteria it can kill , what side affects it can cause, which all medications it can interactions with . Antibiotics are carefully selected based on which bacteria is suspected to cause infection and accordingly prescribed.