Difference between B.O. light

[bobassel]

Who can give me the difference between the two Black out lamps nbrs.
In T.M.-10-1263 / 1942, the lamp bulb has nbr GPW 13153 6 volt-10c.p. sc 2405s made by Corcoran Brown.
In T.M.-10-1263 / 1943, the lamp bulb has nbr GPW 13152 6 volt-10c.p. sc 2405s ?
The parts list gives also nbr GPW 13153. (All 6 volts)
(this all in combination with resistor; GPA 13184 or later type GPA 13189.
Bob