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1) Silicon PG Revision: The PG2.0 is the new revision that fixed some of the issues on PG1.0. Please see the following documentation for comparison:
2) Safety Level: B is for Functional safety SIL-2 compliant targeted devices that enables safety monitoring similar to AWR ASIL-B targeted devices. Refer table 7.1 @https://www.ti.com/lit/ds/symlink/awr1843.pdf
Also refer to following link for functional safety:
3) Security: S is for HS ( High Security) device that has secured boot feature and hardware crypto accelerators required for secured application.
Let me know if you need more information.