I'm not sure if you still have the same problem but I've noticed that certain LUT's that you can find in Speedgrade can help match the two programs and the way they display the image. Also I've realized the "Input Saturation" setting DOES NOT translate well into Premiere.
Try this:
1. Take a grade you made and turn the Input Saturation up quite a bit for that specific grade..
2. Create a separate .Look file with that grade.
3. Turn the Input Saturation back to default and make a separate .Look with that grade.
4. Switch between the grades from Step 1 and Step 3 to see if it better matches your Speedgrade image.
Note: If these still don't match, what matched my two programs almost perfectly was using the DAY4NIGHT - SL - 3527.itx LUT in the Speedgrade options under: Timeline > Setup at the bottom. Use this LUT in conjunction with Steps 1 through 4. Experiment with different LUTs.
I hope that helps! :-)