No, and they will presumably never be either, as these are too complex to backport to older game executables, and R* has changed the newer game versions in such a way that there is no way to port CitizenFX/Five to them due to explicit checks that have been added to trigger the DRM system (the Arxan code Guards - which protect the application and each other) when CitizenFX is running, and causing the entire game to cease functioning when these checks are removed, or an attempt is made to run CitizenFX on these newer game versions.
The only way around would be to remove the entire DRM system, which outside of technical feasibility would be a violation of international (2001/29/EC, WIPO Copyright Treaty) and United States (17 U.S.C. § 1201) laws and would open up this project to potential civil and criminal liability.