Hi Yeliab,
Yes, all content will be the same.. but...
V1.3 comes with a new version of the mission editor. Unfortunatly there are a few bugs still in it which may cause problems when using the editor.
to avoid this, it's best to install the original editor first, and to do this, you must install V1.1 first.
so my suggestion is, first upgrade to 1.1, then install the original editor and then upgrade to V1.3.
Regards,
Fred