The items are the same as the original game while leveling up towards 100 with a few large exceptions:

"Ultra Rare" now exists as a new tier between Rare and Unique.

"Set Items" are given their own color in every available tier which allows players to instantly see the difference before picking them up.

There are also many "improved" versions of lower level items that are only available around level 100.

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An easier way of looking at it is that the original legendary 105 sets will only spawn around level 100 like the original game and don't have lower level versions.

So in that sense some things are like the original game.

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Since LAO 2.0 makes all Uniques spawn various affixes- it means lower level uniques can be far more useful and are also made available again at the end game as level 100 versions.