The 3157 is a clear bulb and the 3157NA is an amber color.
The 4114 is an ultralong-life bulb with its major and minor filaments rated at 14v. The 3157 has its major filament rated at 12.8v and a much shorter lifespan. 4157 is in between the two bulbs for lifespan rating. All three bulbs produce the same amounts of light.
LL stands for " long life " - more expensive , but supposed to last longer
4057k is a ford number, while 3157 is a napa brand of the same item.
I have successfully installed bulbs 3057, 3157 and 3457 in my Chrysler Town & Country mini-van, for the brake/stop lights.
The 3157 and 4157 produce the same amounts of light from their dim and their bright filaments. The 4157 has a longer life rating than the 3157.
*157 is a double filament. a *057 is a single.
3157
#3157.
A 3157LL means 3157 Long Life, some stores carry it as 3357 bulb or a Heavy Duty 3157.the filament is stronger in the LL bulb.
For all practical purposes, they are interchangeable. To my eye the 3357 seeems to be brighter on the heavier filament. (brake/turn)
maybe wrong bulbs 2057 or 3157 or 1156