difference between SA38 and SE38

SA38 and SE38 both transaction codes are highly critical. SA38 is used to run programs and reports in the system. With SE38 you even view the source code and develop the programs and you can even debug in the sap system causing high loads on the system which leads to performance hit. Due to their high critical nature these tcodes are restricted or locked in the production environment. They are locked by the system administrator in the production system. The only people that have access to se38 are Developers in Development system.