Have you sealed the replacement digitizer in place or is it still "free"? If the digitizer is locked in, you will have to remove it. If you don't damage it, remove the adhesive so that you can run some tests first.
Does the digi ghost touch even if it is only loosely installed over the LCD or only when put firmly in place? On the inside of the digi panel, there are copper/silver traces that go around the clear glass. Copper traces are a sign of a higher quality digi while silver traces are usually associated with low quality digitizers. You normally want to cover the bottom traces with some kapton tape to avoid ghost touching. Jessa wrote a great blog about this a while back.