Bellodgia is dramatically different. The former is a dark, musty carnation, and the latter is a sparkling floral carnation, a far less glamorous but more joyful scent.
The Exclusifs version of No. 22 edt is quite a bit lighter on the aldehydes.
Tabu is much sweeter nowadays, a tad less skanky (say the vintage is a 10 on the scale o' skank, the new is just an 8 ) but just as loud; not quite as rich.
Long Lost Perfume's version of My Sin is as Mimi described-- tamer and less velvety. Like oakmoss, real civet/castoreum/musk/whatev adds incomparable and inimitable depth, but I, too, enjoy and love a lot of the reissues-- some more than the originals. I will also add that, had I not tried the original My Sin and been blown away, I would think the new one is the cat's meow. As it is, it's still pretty darned tasty.
Wear your reforms with pride, man! Even the "worst" ones are better than most the recent offerings.