They are the same product.
The "full" is a traditional perpetual license. Install - register - activate - use.
Does not "call home" to validated that is a paid for install (the one time activation takes care of that).
Internet? Connectivity is needed in order to download and install updates.
(& Yes, you do want those)
The "subscription" license will require periodic internet connectivity. If I recall correctly all "subscription" applications must call home once a month.
That is how the application "knows" it is being paid for and is legit.
While within the call home periodicity connectivity is not required for usage of the application.
As with a "full" license you'll need connectivity to download/install application updates