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So please explain what the difference is between the 275 Rigby and the 7x57 Mauser?

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Case wise, dimensionally, there is no difference.
Brass, dies, etc. - all the same.
The “Rigby” moniker is derived from their specific loading of the same cartridge.
The 275 Rigby was loaded with a lighter bullet and higher velocity than the standard 7X57 Mauser.
What was it, 140gr. Bullet for the Rigby and 170 something for the standard Mauser cartridge?

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According to some sources, anti-German sentiment also came into play when Rigby came up with their high velocity 140gr loading for the 7x57 or 7mm Mauser cartridge, their thinking was the name Rigby would be more palatable to the British stiff upper lip. Whether this was a factor or not who knows.

Apart from recent American loadings with a .275 Rigby headstamp on the cartridges to suit the vanity of some, original cartridges headstamped .275 Rigby seem to be non-existent or a rarity at least. Searches come up with plenty of old cartridge boxes labelled ".275 cartridges for the Rigby Rifle", or similar notation, but no images of the cartridges to prove there was actual ammunition produced with the definitive .275 Rigby headstamp.

In regards the heavier bullet loading for the 7x57/7mm Mauser/.275 cartridges, there is some confusion in this area too. Bell and Corbett were great exponents of the .275 cartridge in what ever moniker it may have been and in both their cases it is often said they used the 175gr bullet. Kynoch however used 173gr bullets in their heavy 7mm loading. Most of the German loadings were probably with the 175gr bullet but I would have thought Bell at least would have been using Kynoch ammunition. I think even he himself mentions somewhere in his writing his 7mm rifle ammunition with 175gr bullets.

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