will I lose out by learning an earlier version of SQL Server?

At work we use SQL Server 2008 R2 from what I can tell and I use it to do many DB queries. I have been asked to select a course available through Skillport and notice that my only selections are for SQL Server 2008, 2008 R2 and 2012. From what I can see online, the latest version is 2014. Would I be at a disadvantage learning any previous version and would it be better to go for 2012 over 2008 R2 (even though that is what it appears we have where I work)? The course tracks have the titles of "SQL Server 2008 R2: Implementation and Maintenance" and "SQL Server 2008 R2: Database Development" vs. "SQL Server 2012: Database Administration" and "SQL Server 2012: Querying". I have the feeling that while the names are different the content is similar except for the different versions they are dealing with. - Thanks, Ben