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Blueprint has 000,100,110,200,400 and pages on 400 already active on acceptance.
100 Master publication has current wrong value for Publication Key.
Changing "DxaMaster" to "DxaMasterCommon" what will happen?
We has to publish all again on 400 level?
Is there impact on environments with import/export if publication key differs?
Publication Key is a part of Publication metadata, it has no direct relation with the publishing content, so republishing of content wouldn't be required. For a DXA application, you probably need to republish Publish Settings page only.
AFIK it (changing) has no impact on import/export either.
However, do make sure to update any mappings in Topology Manager that uses the old Publication Key value, see SDL docs: Editing a Publication
