Thanks for all the replies on this. I hadn't considered calibrating my monitor, but that makes sense. If it's off, that would explain why colors aren't matching. So certainly the place to start. To properly calibrate it, looks like I will need some additional items (color chart or colorimeter). I also do photography, so these would be a worthwhile investment.
Another area I would to improve is entering custom colors. Entering RGB values for every color I want to look at is very tedious, especially when there are dozens. Is the anyway to enter a whole pallet into SE at once (maybe by reading a table with the values)? Is this something keyshot would simplify? If so, I may set up a trial to test it out (too bad SE Foundation doesn't include it).