The answer by Markus is correct, with a small caveat.
It is possible to configure the same set of processing options for the older E(underscore)INCHI algorithm, but that still does not give you exactly the same InChI string, because the version identifier (1 vs 1S) remains different. So please use E(underscore)STDINCHI.
actvs>ens create CCC
cactvs>ens get ens0 E_STDINCHI
cactvs>ens get ens0 E_INCHI
Btw, while academic users do not get full support, do not hesitate to ask this type of questions directly (firstname.lastname@example.org). I will not charge you for this type of simple help request ;–)