The comparison of all three bulbs is below. The biggest difference seems to be in the average rated hours.
#2825 MINIATURE BULB MINIATURE WEDGE BASE - 12 Volt 0.4 Amp T3-1/4 Glass Wedge Base 4.0 MSCP, C-2R Filament Design, 1.06" Maximum Overall Length, 300 Average Rated Hours.
#168 MINIATURE BULB GLASS WEDGE BASE - 14 Volt .35 Amp T3-1/4 Glass Wedge Base Miniature Bulb, 3.0 MSCP C-2F Filament Design, 1,500 Average Rated Hours. 1.06" Maximum Overall Length.
#194 MINIATURE BULB GLASS WEDGE BASE - 14 Volt 0.27 Amp Miniature Wedge Base, 2.0 MSCP, C-2F Filament Design. 2,500 Average Rated Hours, 1.06" Maximum Overall Length.
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