M4-1 (upper), L40sx M3 (lower). Identical casings, ribbon cables, etc. The M4 keyboard even has casting outlines for the two rectangular slots on the L40 keyboard into which the L40 case lid latches.
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L40-M4-01-comparison

Added to L40sx - M4-1 keyboards — 5 months ago

M4-1 (upper), L40sx M3 (lower). Identical casings, ribbon cables, etc. The M4 keyboard even has casting outlines for the two rectangular slots on the L40 keyboard into which the L40 case lid latches.