Is the UTF-8 encoding scheme the same irrespective of whether the underlying system uses ASCII or EBCDIC encoding?
There is only one definition of UTF-8. It is the precisely the same, whether the data were converted from ASCII or EBCDIC based character sets. However, byte sequences from standard UTF-8 won’t interoperate well in an EBCDIC system, because of the different arrangements of control codes between ASCII and EBCDIC. Unicode Technical Report #16: UTF-EBCDIC defines is a specialized UTF that will interoperate in EBCDIC systems.