Purview Integration during Merger and Acquisitions

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Hello,

We are currently in the process of merging with two other organizations and are looking to integrate our Microsoft Purview environments.

All three organizations have different sensitivity labeling schemes, and we would like guidance on the best approach to achieve a unified labeling strategy across the merged organization.

Specifically, should we create a new, common set of sensitivity labels for the combined organization and plan a phased transition for users? One of the organizations already has the majority of its documents labeled, so maintaining those existing labels during the merger is a key concern.

We are also looking for best practices to ensure that existing labels are preserved when the two additional organizations are onboarded into Purview, while still moving toward a consistent, unified labeling framework.

Any suggestions or if any one had already been a part of such a merger, please share your experience