i don't know, because i don't own cable 169 yet. guess sound quality will be similar, maybe sound differences because of litz in (even darker background) and copper+spc mix in 169. but can't know if they are noticeable before doing serious ab between them.
about weight, 165 is only 23.5g, don't think 169 will be much more lighter.
conductivity mostly depends of total section (diameter) of wire per signal (wider, lower AWG, means better conductivity), given same length of wire (longer means lower conductivity).
plugs and solders also contribute to conductivity.
and material (quality) of wire does it as well. i compared two copper wires (solid core) last year. 1m of neotech UP-OCC 24awg measured 95mΩ, vs. 120mΩ of simple OFC.
but resistance/conductivity doesn't tell the whole thing. found way better sound (background noise, definition, imaging) with 26awg up-occ frozen wire than with 22awg ofc wire (thicker, lower total resistance).
there is a common problem with most chi-cables: you can't trust used material matches advertised material. read
this (most claimed 7n occ chi-cables are not 7n, and are not occ).
so it's difficult to establish comparisons. i only own a boutique but artisan cable, from impactaudio.
but read these comments i received by pm:
"I remember talking to another member who owned extremely expensive kilobuck cables from Effect Audio. He bought cable 125 on a lark and was extremely impressed saying that he felt it didn’t disappoint coming from his high end cables."
".. owned Horus, Leonidas, and Janus among other things. Super expensive cables. But he did say he was surprised at the performance of cable 125"
"I actually own two other cables that use genuine litz wire. I own a pure silver OCC litz cable from Norne Audio the Norne Therium and also a PlusSound Echo+ that uses type 6 UPOCC litz copper wire. Both cables sound notably different from my modified cable 125 (I just switched out the stock plug with an Oyaide platinum/palladium plug) while listening with Solaris. The Norne silver litz cable sounds very smooth with a bit of spotlighting on the upper mids. It sounds flatter in terms of depth, and noticeably dryer than cable 125. Depth is easier to perceive on cable 125, and it sounds meatier from top to bottom in direct comparison. The PlusSound Echo sounds very different from cable 125. Cable 125 sounds thick and organic, but still very clear, whereas the Echo sounds lean and analytical. Cable 125 reminds me of my Stax setup, whereas the Echo makes my Solaris sound like the old Sony house sound (Ex600, SA5000) which was much leaner, and more analytical compared to the warm, bass elevated sound they currently pursue."
"..the Norne and cable 125 feel close, but cable 125 has fuller lower frequencies as the sound stage and especially the depth feel more pronounced on cable 125".
and now, consider that i've found even darker background, better imaging and soundstage, with cable 165 than with cable 125 (i've confirmed this after AB listening in different moments, different gear; don't have any doubt; although you can find you prefer the latter for some source+phones combo).
i'm sorry for boutique cables, but you can find great value chi-cables for an small price fraction. however, these chi-cables show some disadvantages: obscure specifications, smaller variety of plugs, worse plugs and solders in most cases, qc issues, etc.