Yes, you can point multiple vROps versions at the same vCenter. Keep in mind only one version can be registered as an extension at one time, so on the "second" vROps just opt not to register the extension.
Some additional information on the previous posts.
You can have multiple instances of vROps monitoring the same vCenter. It works and is fully supported.
Only one of them will be registered as a vCenter extension, but both can be collecting from it.
thanks for your reponses. How do we make sure the the 2nd vROps does not register the extenstion with vCenter? How can we not opt to register the extension?
The simplest way I've found is to, when registering a new vSphere adapter, expand the Advanced Settings option at the bottom. Supply just some junk credentials which you know don't work--can be literally anything.
The adapter instance will be saved but the extension will fail to register. I'll present a warning dialogue that it couldn't register the extension but it'll let you continue. You still need to provide valid credentials that allow the adapter to collect from vSphere, just provide separate credentials under Registration user/password which will cause it to fail.