Wp8.1 app Support in Wp 8

hi All,
I Build an application in vs2012 for windows Phone 8, now i'm using Vs2013 and making small changes in app and rebuilding it, for testing i'm using wp 8.1 device. I didn't retargeted my project to wp8.1.
So my Question is :Will my app run on both the Operating Systems without any issue or do i have to build app separately for wp8 support and wp8.1 support,what changes i have to?

You can create a wp8 app and it will work on both wp 8 and 8.1.  You cannot get a wp8.1 app to work on a windows phone with the wp8 os so if you want to have a wp8.1 app and still support wp8 you will need to release both wp8 and a wp8.1 version

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