Hi, You must know the technical periods by which data is really saved in liveCache. I think you can first have a look at SAP note 737230 then SAP note 410680 which explains technical periods and disaggregation logic.
Then you need to notice the data you release to SNP. If you do not use any period split, I think the data should be the same in DP and SNP. Period splitting always causes rounding effect.