Every published spec for both machines, side by side. The verdict below is computed straight from the spec sheets, not opinion.
Across 6 measurable specs, this matchup is a dead heat: 2 categories to the Case IH Farmall 120C, 2 to the New Holland T4.120, 2 tied. Machine pages: Case IH Farmall 120C and New Holland T4.120.
5,620 lb (7,351 lb with optional auxiliary lift ram)
Lift Control Type
12x12: mechanical draft control, top link sensing; Hi-Lo: electronic draft control, lower link sensing
12x12: rear hitch control levers; Dual Command cab: Electronic Draft Control (EDC) mouse and fender switches; single-lever Lift-O-Matic Plus (optional on 12x12, standard on Dual Command ROPS)
Transmission Type
12x12 electronic power shuttle (standard); 20x20 electronic power shuttle with creeper (optional)
12x12 mechanical shuttle (standard); 12x12 power shuttle, 20x20 power shuttle with creeper, 24x24 Dual Command Hi-Lo powershift with electrohydraulic power shuttle, or 40x40 Dual Command with creeper (optional)
No. of Speeds
12F/12R (20F/20R with creeper optional)
12F/12R (standard); 20F/20R, 24F/24R or 40F/40R (optional)
Max Travel Speed (Forward)
Not Published
20 mph (12x12 and 20x20 creeper, standard; 25 mph transport option); 25 mph (24x24 and 40x40 Dual Command)
Max Travel Speed (Reverse)
Not Published
Not Published
Clutch
Not Published
Not Published
Differential Lock & Limited Slip Options
Electro-hydraulic differential lock; Class 1.0 MFD front axle with limited slip