Yes that's right. Not sure what the 4961 actually relates to, but 9.1.4691.0 seems to mean it's version 9.1, service pack 2, with no hotfixes installed.
Someone else may be able to confirm, but if memory serves, I think the 4691 relates to the number of hotfixes / patches released since day one, so for instance v8.6 was initially 3808, then the first major update was 3878.