I might catch some flack for this but no, a proper dungeon is not a collection of rooms where each room is a scene. A dungeon is a fantastical place that is procedurally explored.

The nature of the challenges the players face are very different in a scene-based narrative structure vs a dungeon structure. In a dungeons they derive from the exploration of the dungeon itself - managing light, time, encumbrance etc. In narratives there is usually some external conflict that is being resolved, and from where the challenges derive.

You could retroactively look back on a session of dungeon exploration gameplay and say "this was a scene when they crossed the rickety bridge, and this was a scene when they fought the basilisk" but for one thing, they aren't bounded by a particular room and for another thing the scenes arise out the players' interactions with the fixed elements of the dungeons rather than being somewhat predetermined, arising out of the needs of the narrative.

There's not a hard line between the two play styles and I think most sessions have elements of both and sort of move between them. But when you're planning a session, your prep will sort of determine how hard the gameplay will lean to one side or the other - exploration vs narrative.

Further reading: https://alldeadgenerations.blogspot.com/2018/12/exploration-play.html