My company is part of the VSPP (I believe it may be vCAN now...) and we have a boat load of licenses. We are subscribed to vCenter Server Standard, and Horizon Enterprise. Part of our Horizon Enterprise license, entitles us to vCenter Server for Horizon. As far as my knowledge goes, they are the same license. One just comes bundled with Horizon (generally), and one is standalone. I would reach out to support just to be sure, but I believe you are just fine to run server workloads under that license.
-vTimD
http://www.vtimd.com
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