Change in SFDC Field Type to Same as Marketo

So in trying to run some reports for my sales team in SFDC, I realized that Behavior Score & Demographic Score weren't set as numbers. I changed those field types, clicked yes on the "This will destroy values in this field", and carried on my merry way assuming that, since those fields were integers in Marketo, they would just update the now empty fields in Salesforce. That didn't happen (at least not that I can tell - I only found a few fields with values in them this morning).

Just wanted to see if these fields will continue to update from Marketo or if I need to blow them away and start over (which I'd really rather not have to do).