The general premise has almost nothing in common.
In Gygax's explanation in his DMG, in Moldvay's explanation, in the 5e example of play in the Basic PDF with the keep and the gargoyles and so on, the general premise is that the GM has written up some setting in advance and then starts describing that to the players, thus prompting them to declare actions. In both Gygax's and the 5e example of play, some of the earliest declared actions are requests for more information (by inspecting things, poking at things, etc).
Perhaps I've not described In A Wicked Age with sufficient clarity, but no one does anything before the group sits down to play their session. There are no GM maps or notes. There are no secret NPCs, because all the characters have been listed by the group as part of the "interpretation" of the Oracles. There are no actions of the inspecting things, poking at things etc variety, that oblige the GM to reveal more of what they have prepped.
I find it hard to think of anything more different from how D&D and the role of prep is presented that still counts as a RPG.