What is the difference between the John Deere 8RT 410 and 8RX 410 Tractor?

Here is how the John Deere 8RT 410 and John Deere 8RX 410 Tractor compare on John Deere's published specifications:

• Horsepower: John Deere 8RT 410 404 hp vs John Deere 8RX 410 Tractor 404 hp
• Pto horsepower: John Deere 8RT 410 310 hp vs John Deere 8RX 410 Tractor 310 hp
• Weight: John Deere 8RT 410 34400 lb. vs John Deere 8RX 410 Tractor 43300 lb.