Indoor clay/high grip? Hell Yes, I can tell the difference between the 50C Thunder Power and my 30C Turnigys in both the 1/8 scale and SC.
Could it be the c rating? I don’t know.. all I know is my TP's are worth about 2.5-3 seconds per lap on a 20-25 sec track.
Outdoor/low grip? No difference in LT’s.