That is called marketing, to get people to buy... the programs are the same
The 11.89€ charge is for Photography plan which includes Photoshop and Lightroom , it is a discounted offer pricing and as you buy the applications as single app they are on standard pricing which is 23.79€ .
The versions of the applications are same there is no difference with the features in both the purchases. It is just in Photography plan you get cloud storage of 2 GB and in single app Photoshop you get cloud storage of 20 GB.
Hope it helps.
Why is it that on my Adobe CS screen it states that I can buy the "Adobe Creative Cloud Photography Plan" for 11.89Euro/mo and when I follow the link the price moves up to 12.29Euro/mo?