21,987 mm x 45,237 mm x 16,637 mm Timken LM12749/LM12710 tapered roller bearings

We NTN BEARING CORP.OF AMERICA 30000 Oil Limiting Speed (r/min): work closely with our 21,987 mm x 45,237 mm x 16,637 mm Timken LM12749/LM12710 tapered roller bearings manufacturing partners to bring the best 0.88 Fatigue Load Rating (kN): value 21,987 mm x 45,237 mm x 16,637 mm to customers.

What is LM12749/LM12710 bearing interchange？