Marsha, the top is fired face up to the air leaving a shiny top. The bottom is fired face down to the mold so it comes out of the mold with a matte finish. To make them both look the same the bottom needs to be fire polished according to the instructions in the Box Basics project sheet.
http://www.colourdeverre.com/docs/33.pdfI fire my 2 pieces in the same firing...they turn out just fine. You may want to adjust your hold time if the top looks too "cooked". The schedules in the project sheets are just a starting point...you have to find what works best for your kiln.
If the top is bumpy you might want to try refiring it to a higher temp and watch it closely till it smooths out then move on to the anneal.