The difference is outside plating and the material of rubber for waterproof.
Part number Plating Material of rubber
LF10WBR-C Nickel Silicone (Black)
LF10WBR-C(03) Black chromium Silicone (Black)
LF10WBR-C(31) Nickel Acrylonitrile-butadiene rubber (Gray)
Part number Plating Material of rubber
LF10WBR-C Nickel Silicone (Black)
LF10WBR-C(03) Black chromium Silicone (Black)
LF10WBR-C(31) Nickel Acrylonitrile-butadiene rubber (Gray)
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