TCC5 and TCCD use the same die.
My theory is: TCCD seems to be more of speed grading done by Samsung. I guess not many chips were getting out the door to the market in the form of TCCD, so Samsung relaxed the speed grading and started bringing out TCC5. You'll find very mixed results with TCC5 - some doing really good(as good as TCCD), some doing average and some doing poorly. Hence my assumption