Here is the diffrence
1141 Headlight, Spot Single Element/1-Contact, 12 Volt, 21 Candle power, Standard size 2-pin base, pins directly across, 1 15/16"
1156 Bright Bulb, 12 Volt, 35W, Single Element, light blue glass, bright white light, ( 2-pack), Standard size 2-pin base, pins directly across, 1 15/16" tall.
looks like the 1156 is brighter