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When you download CAMS data, C3S data and other data from ECMWF, you can specify to get obtain the output data in on its archived grid or on a Cartesian lat/long grid and at a custom resolution.
You can specify a higher output resolution than the archived resolution, but the resulting data will not contain any more information than the original, it has merely been interpolated[1] to a higher resolution. This makes the output look smoother, but does not increase the accuracy or the precision of the data. However, if you choose to interpolate to a coarser resolution than the archived resolution you should be aware that the data can be aliased, unless care was taken to avoid this.
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