Hello all Connector experts! 

We are in need to change the criterium for the marketing data sharing rule (MDS) for Contacts on the SF-Pardot Connector.  The current rule for Contacts bring about 78K prospects into Pardot and uses "custom field 1 = x".    We need to change the field value that the MDS rule looks at for Contacts to another field with another value to begin syncing the SAME 78K, plus about another 100K.  Such that it will now be "custom field 2 = y".   Question:  when we change the MDS rule for which contacts sync to Prospects, what will happen to the existing 78K Prospects that are actively syncing with Contacts?  For example, will all of the prospect history, grades, scores, remain?  what about existing segmentation lists?  other considerations?

Any help or direction to documentation is appreciated.  We have looked at the Salesforce-Pardot Connector v2 Implementation Guide.  While that covers how to use the MDS rules, it does not cover considerations when needing to change the MDS rules after initial successful implementation.

Thanks,

Steve