Yep it does greatly differ from Destiny 1, In some good ways (like a really fun leveling experience) and lots of bad ways (everything else). This "DLC" is 100% cut content and to be honest I shouldn't be surprised since it was proven all the content in Destiny 1 outside of Rise of Iron was cut content as well.
Just to give a small taste of my point, heroic strikes was in Destiny 1 day 1. But in Destiny 2 its a feature added if you pay $30. They also repeated the exact same issue Destiny 1 had and that was Destiny "DLC" taking away content you already paided for "Nightfalls". Also mark my words if DLC #2 adds anymore strikes you will lose both Heroic's and Nightfalls again unless you pay for that DLC.
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Personally I would even say its a step back from TTK.