Data downloaded from ECMWF is different from the sample data

[NightWalkerqqq]

I have downloaded ERA5 data following instructions on ECMWF. To check the accuracy of data, I downloaded data on 2022-01-01, just the same as the example data provided in Google Cloud Bucket, but actually they were slightly different. Would I ask which API should be used to download these data, or could you publish a script or instructions for constructing input data?

Thanks a lot !

[Tlmnk]

I am not sure, but maybe this could explain it: ERA5 is on 0.25 degree resolution while the final model is run using data from the ECMWF high resolution model that has a 0.1 degree resolution and is then downsampled to 0.25 degrees before being used as input. Maybe this explains the difference?