Spectrum 9.3 does support Windows Server 2012 R2 and makes no distinction between Windows 2012 releases.
The Spectrum 9.3 Release Notes do not specifically list out minor releases, unless it is intended to mention minor releases that are not supported.
The Spectrum 9.3 Release Notes do not specifically list out minor releases, unless it is intended to mention minor releases that are not supported.
UPDATED:
April 20, 2017