No. Synchronization implies two-way data sharing. Top Connector accesses the data on your MLS and imports (or copies) the information into your Top Producer database, which does not affect the original MLS data. Future changes made to the information in Top Producer will not be updated on your MLS.
If you have previously imported a listing using Top Connector, then subsequently made a significant number of changes to the Listing on your MLS, you can avoid having to make the same changes again in Top Producer by re-importing the information. This will over-write any of the changes you made to the listing data in Top Producer, but will keep other information like Listing Activities, Listing Parties, Notes, and Service Reports.
To re-import MLS data for a previously created Listing, open the Listing in Top Producer, click the Listing Info tab, and click Edit Listing Information. The MLS Search box is available at the top, where you can enter the MLS number and re-import the data.