There will be two of these Stream_Autocomplete files in your path - one for your old Outlook profile and one for your new.
Based upon the modification date you can determine which is old/O365 and which is new/Google. In your case, the O365 should have a modification date of yesterday since that's the last time it was used.
For example the O365 one may be called Stream_Autocomplete_0_XYZ.dat & your Google one may be called Stream_Autocomplete_0_ABC.dat
- Close outlook
- Move the google one to your desktop
- Duplicate the O365 one
- Copy the filename of the google one on your desktop
- Change the name of the duplicated one to the google name
- Open outlook
- You can delete old google one on desktop now.