<TABLE border=0 cellSpacing=2 cellPadding=0 width=780><TBODY><TR><TD class=cellcenter bgColor=#e1e4ee width=37>19
</TD><TD class=cellcenter bgColor=#e1e4ee width=94>4157K (LL) </TD><TD class=cellcenter bgColor=#e1e4ee width=89>Wedge (2) </TD><TD class=cellcenter bgColor=#e1e4ee width=102>W2. 5x16q </TD><TD class=cellcenter bgColor=#e1e4ee width=55>12. 8 </TD><TD class=cellcenter bgColor=#e1e4ee width=59>2. 23 </TD><TD class=cellcenter bgColor=#e1e4ee width=55>32 </TD><TD class=cellcenter bgColor=#e1e4ee width=73>
C-6 </TD><TD class=cellcenter bgColor=#e1e4ee width=85>4,000 </TD><TD class=cellcenter bgColor=#e1e4ee width=40>
27 </TD><TD class=cellcenter bgColor=#e1e4ee width=69>
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</TD></TR><TR><TD class=cellcenter bgColor=#e1e4ee width=37></TD><TD class=cellcenter bgColor=#e1e4ee width=94></TD><TD class=cellcenter bgColor=#e1e4ee width=89></TD><TD class=cellcenter bgColor=#e1e4ee width=102></TD><TD class=cellcenter bgColor=#e1e4ee width=55>14 </TD><TD class=cellcenter bgColor=#e1e4ee width=59>0. 59 </TD><TD class=cellcenter bgColor=#e1e4ee width=55>3 </TD><TD class=cellcenter bgColor=#e1e4ee width=73>
C-6 </TD><TD class=cellcenter bgColor=#e1e4ee width=85>10,000 </TD><TD class=cellcenter bgColor=#e1e4ee width=40></TD><TD class=cellcenter bgColor=#e1e4ee width=69></TD></TR><TR><TD class=cellcenter bgColor=#eeeeee width=37>20
</TD><TD class=cellcenter bgColor=#eeeeee width=94>4157NAK (LL) </TD><TD class=cellcenter bgColor=#eeeeee width=89>Wedge (2) </TD><TD class=cellcenter bgColor=#eeeeee width=102>W2. 5x16q </TD><TD class=cellcenter bgColor=#eeeeee width=55>12. 8 </TD><TD class=cellcenter bgColor=#eeeeee width=59>2. 23 </TD><TD class=cellcenter bgColor=#eeeeee width=55>24 </TD><TD class=cellcenter bgColor=#eeeeee width=73>
C-6 </TD><TD class=cellcenter bgColor=#eeeeee width=85>4,000 </TD><TD class=cellcenter bgColor=#eeeeee width=40>
27 </TD><TD class=cellcenter bgColor=#eeeeee width=69>
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</TD></TR><TR><TD class=cellcenter bgColor=#eeeeee width=37></TD><TD class=cellcenter bgColor=#eeeeee width=94></TD><TD class=cellcenter bgColor=#eeeeee width=89></TD><TD class=cellcenter bgColor=#eeeeee width=102></TD><TD class=cellcenter bgColor=#eeeeee width=55>14 </TD><TD class=cellcenter bgColor=#eeeeee width=59>0. 59 </TD><TD class=cellcenter bgColor=#eeeeee width=55>2. 2 </TD><TD class=cellcenter bgColor=#eeeeee width=73>
C-6 </TD><TD class=cellcenter bgColor=#eeeeee width=85>10,000 </TD><TD class=cellcenter bgColor=#eeeeee width=40></TD></TR></TBODY></TABLE>
Sylvania's website has more info - Looks like the candle power on the LL vs. NAK is a bit different - the LL is brighter.
OSRAM SYLVANIA: Sylvania Online Automotive Lighting Catalog

Silly me - It's because one is Amber... one is clear...