Difference between reports S_ALR_87011990 x S_ALR_87011964

Hello friends...

There is a difference between reports S_ALR_87011990 x S_ALR_87011964:

In report S_ALR_87011990 we have:

Cia: 1001

Asset Class: Z2020012

Total Amount: 11.003.324,98

Deprec: 4.959.798,60

And inreport S_ALR_87011964 we have:

Cia: 1001

Asset Class: Z2020012

Total Amount: 11.060.488,20

Deprec: 4.960.116,18

Why these differences occur?

Thanks in advanced.

GLippmann