Sigma nought values change working with Sentinel-1 SLC

so they look at your area from entirely different angles and positions.

Backscatter is very sensitive to orientation of objects and surfaces, especially in agriculture.
This is why I included the reference to this topic in the first answer: Unexplained differences between different orbits

You can only compare images which are acquired from the same relative orbit. Sentinel-1 A and B have a revisit time of 6 or 12 days. Images from the same date are acquired from different relative orbits and can have large differences.

Have a look at how angle and looking direction strongly effect the backscatter of PAZ data in this example: Opportunity for scientific use of PAZ data

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