• Advanced Point Defense weapons can now be used on Frigates, Defense Station and Fortress, Juggernaut, and Flagship.
  
• Wayfarers can now be used on Juggernaut and Flagship.
  
• Opulent components are usable on all NSC-added ship classes.

• SLGT reactors can now be used on all NSC-added ship classes.
  
• Power generation numbers have been recalculated upward to make early DDM reactors competitive and late DDM reactors appropriately powerful.
  
• Juggernaut Microgate reactors get a significant power boost to accommodate the much larger NSC version's loadout options.

DDM Mk1 and Mk2 reactors are about 10% below NSC reactors of equal tier. Progress from Mk3 onward follows the established SLGT formula in nearly all cases.

• DDM thrusters can now be used on all NSC-added ship classes.
  
• Carriers, Dreadnoughts, and Flagships can have a little Evasion with T6+ thrusters, as a treat. :3
  
• Little Rascal/Hyper Vector Afterburners and Multirole Performance Suites now block and are blocked by regular/advanced Afterburners and each other.
  
• New Multirole Performance Suites for Frigate, Battlecruiser, Carrier, Dreadnought, and Flagship.
  
• Tweaked MPS for Destroyers, as Frigates are the designated PD picket now.

• Reworked existing Apophis Ship Sections to actually have more slots than base NSC sections.
  
• Created new Apophis sections for NSC Frigate, Battlecruiser, Carrier, and Dreadnought.
  
• One bonus ship hull is included, but is disabled by default. If you've read this far, good luck in finding and enabling it. If you dare. :3

Everything might be a little overtuned, but sections on a given ship should at least be balanced against each other and generally better than base sections.

• DDM shipyards now recognize Drydocks as a valid source of shipyard capacity boosting.
  
• DDM Anchorages are now worth 200% of NSC anchorages, rather than vanilla ones.

• Lunar, Solar, and Galaxy Carriers now have NSC Special Slots.

Only in English though, sorry.

• Asteroid Artillery can now use Linear Cannons and Nebula Missiles.
  
• Maginot Command Platform can now use Wayfarer missiles, EW Missiles, and advanced PD guns.
  
• Attack moons can use Opulent components; Now every attack moon can be a Disco Moon in your heart. <3
  
• Attack Moon and Behemoth Planetcraft reactors have gotten a slight power increase, since SLGT components are very power-hungry in large numbers.
  
• NSC Special Slots have been added to Attack Moons, Behemoth Planetcraft, and Systemcraft.
  
• If you have Stellar Manipulation or Hyperquasaric Megaconstruction, they're also on the Class-O Systemcraft and Gargantuan Quasarcraft, respectively.

That should be about everything! It's all a little bit of gut feeling, a little bit of sussed-out math, and a lot of casual disregard for the balance of the universe. But to be fair, if you're using all of these mods together you probably didn't care about that last one anyway. Have fun!