What is the difference between Microchip part number PD81101ILQ-TR-LE and PD81101ILQ-TR?
PD81101ILQ-TR-LE is the current product based on latest revision of silicon. PD81101ILQ-TR is EOL for some 3-4 years. It is an earlier revision silicon, it is not under warranty and should not be implemented in any designs.
Also, “LE” does not indicate “low energy”.