Below is from a supplier of custom parts. Aftermarket lever page.
https://rangerpointstore.com/marlin-big-loop-levers-stainless-steel-1894-336-308-338-444-1895-450m/WHICH LOOP LEVER DO I NEED?
1. Marlin “Rifle Caliber” models *mostly* all use the same lever based on their trigger plate + butt stock
- Marlin Pistol Grip Butt Stock Lever, Black (1895 45-70, 336 30-30, 308/338, 410, 444, 450M)
- Marlin Straight Grip Butt Stock Lever, Black (336 30-30, 308/338, 410, 444, 1895 45-70, 450M)
2. Marlin 35 Rem rifles need a special lever with an additional cut in the control blade for smooth cycling
3. Marlin 1894 “Pistol Caliber” rifles all use the same lever based on their trigger plate + butt stock
- Marlin 1894 Straight Butt Stock Lever, Black Nitride (357 Mag, 44 Mag, 45 Colt, 218 Bee, 35-20, 25-20, etc.)
- Marlin 1894 Pistol Grip Butt Stock Lever, Black Nitride (357 Mag, 44 Mag, 45 Colt, 218 Bee, 35-20, 25-20, etc.)
So if your dark and your 336 both have pistol grip stocks or both have straight grip stocks, then it would seem likely based on this.
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