Hi, here is in short what I have read about the new MiG-29K/KUB, hope that answers part of your questions:
1. The new K and KUB will have close to 100% identical fuselage, wings, etc.
Basicly the K will be the same in outer view as the KUB, only the back seat removed and replaced with other equipment or fuel to keep the balance of the aircraft. Reason could well be economy from development and production costs.
2. MiG-29M/M2/K/KUB and MiG-35 form a new family of aircraft with identical airframe.
3. Neither of the above will have the typical MiG-29A/C/UB air intakes on top of the fuselage and moving covers inside the intakes. These are replaced with nets, just like on the Su-27/30/33, thus saving weight and giving free space for more fuel and equipment. Considering that the K and KUB will operate mostly on board aircraft carriers, whose flight decks are always carefully swept from trash and dangerous objects, there seems to be no practical need to have the old system with moving covers and additional intakes.