Librem 5: Hardware Revisions Number

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Are there hardware iterations inside a batch of Librem 5?

Hi! I am currious if all Librem 5 from a batch are the same or are there some improvements over time. For example is an Evergreen shipped mid 2021 the same as Evergreen shipped March 2022? At the end of the day Purism is constantly gaining insights on the product design and on the quality of the components. So maybe Purism is doing some minor improvements, or not? Is there any chance to learn what has been improved over time?