What's your goal? There are some similarities/parallels, but
GW seems to have intentionally avoided making drukhari "craftworlders, but spiky." So between the intentional lack of a perfect 1-to-1 equivalent, the rule changes over time, and the fluff retcons, we could probably make connections in different ways depending on what you want to do with those connections later.
If it's just for funsies, I think you might be trying a little too hard to nail down parallels that aren't quite there. A farseer and a grotesque don't really have anything in common beyond, "take up an
HQ slot," and, "are better supports than beatsticks." We can still have fun, certainly, but pinning down which step on the wych career path is the closest match for an aspect warrior might be fruitless.
In the Eldar and Dark Eldar armies, some units are quite similar in terms of the role they fill, so I'm wondering what equivalents you can pinpoint.
Let's see...
* Narratively, incubi are definitely the counterpart to scorpions. What with the Arhra/Drazhar/Karandras stuff. Mechanically, incubi have traditionally been sort of a fusion of scorpion (gun hats, armor) and banshees (fleet, power weapons). I'd say their current rules make incubi closer to banshees than scorpions, but narratively I'd give it to scorpions.
* Pretty hesitant to compare wyches to banshees. Aside from both being especially agile (women more often than not), they don't really have much in common. Banshees are shock troops that you send in to carve through heavy infantry. Wyches are usually more of a tarpit/play with their food unit. I guess you could draw parallels between the banshees' screams (used to weaken the enemy) and wyches' tarpitty-ness, but that feels like a bit of a stretch. I'd be tempted to compare wyches to dire avengers (especially the various shimmer shield + defend builds), but that feels like quite a stretch as well. They've both been tarpits. They've both been moved from elites to troops (and back to elites for avengers). But honestly, wyches don't really have a clean counterpart.
I guess, if you count the old days where harlies were a craftworlds-only unit, wyches bore some similarity there? Invul saves. Fast movement. Anti-tank pistols. But still. Stretching.
* Hawks and scourges are both the "bird guys." Plus, they both have high
RoF anti-infantry weapons as their base guns, and they both used to be pretty good at stunlocking tanks with haywire weaponry. That said, scourges have always felt more directly comparable to something like a devastator squad than the hawks. Scourges are pretty clearly the result of someone going, "Take our 4 heavy weapon devastator rules, but strip off all the defense, and add mobility."
* Falcon = Ravager I guess. Both were your source of 3 S8 shots for a long time. Both are
HS. The falcon being a transport throws this off a bit.
* Talos has always been vaguely the counterpart to the wraithlord, but they've diverged quite a bit at this point.
* Grotesques = wraith guard/blades. Sorta. I guess. In that they're both the durable, multi-wound units that don't fit into transports very well. Playing foot coven always felt vaguely analogous to playing an Iyanden wraith host.
* Reavers = spears. Both are melee bikers.
* Warlocks were sort of vaguely counterparts to haemonculi back in the day. Less so now, but the 3rd and 5th edition dark eldar books had them priced similarly, capable of fitting multiple bodies into a single force org slot, etc. Both were cheap support
HQs. You can also draw comparisons between spiritseers (which were sometimes just warlocks with a 5 point upgrade) and haemonculi both being used to babysit the wraiths/grotesques.
* Warlock conclaves currently feel sort of like the counterpart to archon courts? Bag of special tricks. Clearly meant to hang out with a specific type of
HQ. Etc.
* Mandrakes have been vaguely scorpion-y. Both infiltrate/outflank. Both have traditionally had stealth buffs. Both have generally had S4 stabbing attacks. Yes, scorpions are comparable to both incubi and mandrakes. This is a pretty good demonstration of how the two factions have similarities but not perfect counterparts.