Possible to sync to SF sandbox after syncing to SF production instance?

[Anonymous]

Is it possible to sync a Marketo instance with a Salesforce sandbox after the Marketo instance has been synced with a Salesforce production instance? To switch it?  Or does that fall under this situation: "Once you sync a Marketo instance to an SFDC org they are paired for good, it's not possible to switch your Marketo sandbox to sync with another SFDC org."

[Dory_Viscoglio]

Hi Jennifer, from what I've been told it's the situation that you mentioned... once synced, always synced. They *might* be able to unsync you, but I've also been told that might not work very well.

[Jep_Castelein2]

Yes, you need a new Marketo instance if you want to sync to a different SFDC instance. Only when you refresh a SFDC Sandbox, you can keep using the same Marketo instance. 

When you have a new Marketo instance, the assets of the old instance can be copied over to the new instance, but NOT the Leads and activity history. 

[Anonymous]

Thanks!