First, assuming that you went to the correct folder an d didn't accidentally go to wherever you installed the original version. The opening to the game and town will be very similar. Most of the updates are to to later map layouts and improved character art and cgs.
Second, the there's literally no chance of the remake version pulling anything from the original version you've installed. The original was made on an older version of RPGMaker, so even if you installed them in the same location they use different file structures.
Lastly, the game is officially complete, but has been getting bug fixes and fanart added in.