SAP Data File size considerably reduced after Unicode Conversion

Hello Experts
I have just performed a CUUC (Upgrade along with unicode conversion) from R/3 4.7 to ECC 6.0 EHP5. The data size that i earlier had was close to 463 GB (MSSQL MDF, LDF Files), after the data export to be converted to unicode the size was 45 GB (10% of actual data size, i feel this is normal after heterogeneous system copy), but after the import again the DATA file size is only 247 GB, is this normal ? or have i lost some data ? For ex, I tried checking tables like MSEG and the number of entries have reduced from 15,678,790 to 15,290,545.
Could you kindly let me know if there is a way to check from Basis perspective if i have not lost any data ? I have followed all the procedures as per SAP Standards.
Waiting for your quick reply.
Best Regards
Pritish

Hi Nicholas
Data is compressed during the new R3load procedure is understood, but why number of table entries have reduced is something which is still a question to me (in some cases increased as well) ? For example
                             Source          Target
STPO                  415,725          412,150
STKO                 126,710          126,141
PLAF                 74,671                   78,336
MDKP                 193,487          192,747
MDPB                 55,329                   63,557
Any suggestions or ideas ?
Best Regards
Pritish

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