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TPS54218: de-capsulation results are different between two date code samples

Part Number: TPS54218

We did de-capsulation for part# TPS54218RTER with two different date codes for our record, one sample was assembled in year 2019 and another in 2012. However, the results observed two die revisions. The internal die marking format including its circuit, part# and TI's logo can match but the only difference is the marking of "PG 1.7" compared with "PG 1.5". Please help to confirm if the information is related with its die revision after 7 years product change. Also please help to verify if the information matched with its date code. Thank you!