I had always thought so. But there are features on the Galaxy's primary hull that don't show up on the Nebula's It also looks like the Nebula's saucer might be missing a few decks as well. And I thought I had read stats that suggested a ship width of 300-odd meters instead of the Galaxy's 460-odd meters.
Additionally, have we seen any other pods for the Nebula than the triangular tactical pod and the oval AWACs-style pod?