This is not a hill I'm prepared to die on but what the heck...
The 'o' sound is different in geophysics and geology*, so I see no reason why it can't be different again in geography. If you're taking the view that the pronunciation of geography should follow other geo- compounds, it would be more like 'gee-oh-GRAPHy' rather than 'gee-OGG-raphy'.
The sound isn't different, the emphasis is. That's no reason to totally elide the ee sound, though.
geophysics: dʒiːoʊfɪzɪks -
https://www.collinsdictionary.com/dictionary/english/geophysicsgeology: dʒiɒlədʒi -
https://www.collinsdictionary.com/dictionary/english/geologyThe first O sound is clearly different in those two words, as you can see from the phonetic transcription.
geography: dʒiɒgrəfi - has the same phonetic transcription as geology for the geo part, but if you listen to the audio clip on the Collins website, the first syllable is somewhat clipped - not totally elided, but definitely shorter than in geology.
https://www.collinsdictionary.com/dictionary/english/geographyIt's the
overlong pronunciation of the first E in geography and theatre, that I was getting at when I brought this up (William G Stewart, when he was quizmaster on 15 to 1, was a prime culprit for this).
If you're arguing for consistent pronunciation, the graph part of geography should sound different too - grɑːf (for southerners) or græf (for northerners).