Here is the difference:
TC5FT: 2.5mm chassis and standard top deck, plastic diffs, copper/gold springs(stiffer than 5R), 6deg caster blocks.
TC5R: thinner chassis and IFT top deck (more traction), Aluminum diff & slipper spool for front, Blue/silver springs(softer then FT), 4deg caster blocks.
I think that is it.
Believe in yourself!