In a nutshell, it's pretty much completely different. In fact, the whole technical reason for "bringing Dalamud down" (to paraphrase Yoshi's own words), was to provide a narrative reason for redesigning the maps, as the original maps and geography of Eorzea was one of the major negative points about 1.0 that players mentioned. Of course, the end result is a number of 1.0 players are now wondering whether they made a mistake, now thinking that 1.0 zones might have been better, but that's life I guess - they made this monster, now they can't complain that it's stomped on a city.

Having said that, there have been some odd geographical changes that simply can't be explained by Dalamud's fall - for instance, in the Central Shroud, the location of Lifemend Stump is in a completely different place to where it was in 1.0 (in 1.0 it was actually north-west of Gridania, along the Furline to what was Camp Emerald Moss (which doesn't exist in ARR). Now it's in a little spot to the east of Gridania, with no explanation as to the change, other than simply retconning it.

Gridania itself doesn't escape from this, specifically the changed location of Stillglade Fane, which in 1.0 used to be in the top left north-west corner of the city (and accessed by a long and winding tunnel), where as now in ARR it's been plonked pretty much where the old aethertye used to be in 1.0. So yeah, a lot of things have definitely been changed, some with no logic as to how it even happened.