[American Constitutionalist]

" On top of all that, the old man Kim Il Sun led his final, glorious march to the mausoleum in what appeared to be a Lincoln limo as well... right down to the oh-so-Detroit-70s 'opera windows' (covered this time).... this is in all likelihood the same car, broke out of storage: "

No , they didn't cover up the oh - so - Detroit - 70s " Opera " windows this time around either.
It's the same car, look in the first picture and you can see the opera window.

[American Constitutionalist]

I meant to say, look at the 2nd picture with his huge picture on the top of the car, on the right side of the car you can see the opera window.