The important difference is that all those early analog computers were either bespoke or suited for a very narrow subset of tasks, like fire control computers. They were very far from general purpose computers, and that is the reason the von Neumann architecture dominates today: we are free to change the operation of the computer without literally changing gears or re-wiring all logic paths. Before, the hardware was the software.
Of course there were analog 'computers' but vacuum tubes were also used to realize digital computers in the early days.