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H0 is 3.5mm to 1 foot running on 16.5 mm track.
00 is 4mm to 1 foot running on 16.5mm track.
The reason for the development of 00 many years ago was the small size of British locos and it was difficult to fit the then available electric motors into them. The solution was to increase the scale by 0.5mm.
It does mean that the gauge of the track is not correct to scale: 16.5 represents 4'1 1/2", hence the specialist gauges used for EM and P4 which aim to get the scale/gauge relationship right. Sadly they remain minority interests as 00 was too well established.
Dublo was just Hornby's trade name for 00.
Hope this makes sense.
Best wishes,
John H-T
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