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Well it is not that simple.
0 Scale is 1:43,5 because half 0 (H0) is 1:87.
On the other hand is 00 1:76 but it uses the same width as H0 Scale, which is not correct, and there is a big community in GB that uses the appropriate width of the track. So it is clearly not about gauges, it is about scale. Spanish models use also the 16,50mm, but they are using iberian wide track.

But there are some oddities to this, whilst in German N-scale is 1:160, Japan uses 1:150.
So it is not only the gauge and scale, it is also the country it is used in.