I'm not sure are you comparing apples to apples?
Porta-Cable
Model 7424
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FEATURES
â€Â¢ 3.7 Amp, AC Only
â€Â¢ Electronic variable speed 2,500-6,000 OPM
â€Â¢ Random, swirl-free polishing action
â€Â¢ Spiral/bevel gears
â€Â¢ 100% ball and roller bearing construction
â€Â¢ Standard Equipment: Polisher, polishing pad #54745, wrench #48779, side handle, and operating manual
SPECIFICATIONS
Power: 120 VAC, 50-60 HZ/120 VDC
Motor Amps: 3.7
No-load Speed: 2,500-6,000 RPM
Spindle Thread Size: Accepts 5/16 - 24
Gear Drive: Spiral Bevel
Wheel/Pad Size: 6"
Length: 11 1/2"
Net Weight: 5 3/4 Lbs.
Shipping Weight: 6 1/4 Lbs.
RELATED ACCESSORIES
Polishing Pad: - Model 54745
Dewalt
Heavy-Duty 6" Right Angle Random Orbit Sander with Electronic Variable Speed - DW443
FEATURES
Electronic Variable Speed from 4,300-6,800 opm provides greater control of material removal rate
Controlled Finishing Systemâ„¢ maintains pad speed and minimizes gouging during start up
Dual-plane counter-balanced fan reduces user fatigue
Sealed 100% ball-bearing construction
Accepts 6", 6-hole hook and loop paper
Rubber-coated gear case for low vibration operation
SPECIFICATIONS
Amps 4.3 Amps
Orbits/Min 4,300-6,800 opm
Orbit Diameter 3/16 "
Dust Collection Yes
Paper Size/Type 6", 6-hole hook & loop
SFPM N/A
Dust Sealed Switch Yes
Pad N/A
Pad Break Yes
Tool Weight 5.7 lbs
Shipping Weight 6.75 lbs
RELATED ATTACHMENTS
DW4395 6" Hook & Loopâ„¢ Pad - Hard
DW4390 Dust Extraction Adapter
You say the throw is the same, I'm not sure--Can't find it in the specs.