Speed is typically not Dextroamphetamine and not as pure (at minimum the dosages seem quite different) though hard to tell what amphetamine you are getting with it. Otherwise yes, pretty close and it's possible that speed is more dangerous because of the amounts people take of it at a time vs the typically lower and more consistent dosing with Dexedrine. Similar for meth and vyvanse.
Speed is typically not Dextroamphetamine and not as pure (at minimum the dosages seem quite different) though hard to tell what amphetamine you are getting with it. Otherwise yes, pretty close and it's possible that speed is more dangerous because of the amounts people take of it at a time vs the typically lower and more consistent dosing with Dexedrine. Similar for meth and vyvanse.