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For the angled deck, pretty much all you have to do is repaint the lines. (And add the arrestor gear, and the catapults, and...)

The 'impact' area of the deck will need to be strengthened, and there will need to be extensions aft and port forward (visible in the comparison pics you posted).

The catapults will be ... interesting. I'm assuming that they wouldn't go with steam, because that would require major plumbing changes PLUS a source for steam (since the ships will be gas-turbine powered). That leaves hydraulic or, more likely, electro-magnetic of the variety being put into CVN-78. Electro-magnetic catapults will require LOTS of additional electric power, however. I'm assuming that the ships are designed to be upgraded for the extra required capacity ...

The 'impact' area of the deck will need to be strengthened, and there will need to be extensions aft and port forward (visible in the comparison pics you posted).

The catapults will be ... interesting. I'm assuming that they wouldn't go with steam, because that would require major plumbing changes PLUS a source for steam (since the ships will be gas-turbine powered). That leaves hydraulic or, more likely, electro-magnetic of the variety being put into CVN-78. Electro-magnetic catapults will require LOTS of additional electric power, however. I'm assuming that the ships are designed to be upgraded for the extra required capacity ...

Yes, I know it would take a whole lot more refit than just "add arresting wires and drop in a catapult." That's why I ended with "and..."

Today's Aviation Week Ares Blog says that the first carrier will be a helicopter ship, the second will be built with arresting gear and EMALS catapults, then the first ship will be retrofit with arresting gear and EMALS during it's first refit.