If you search for EP-spesific names (like 'EP04') or the names of the TS4 (or TS3) hairs you want to find, you could get better results. Trapping is another creator you might want to check out for 3t2 (has her own page, but also a lot on GoS and various other sites). They're often roughly in the area of TS2 hairs, and those three tend to have several of those hairs. Delirium Sims Default Replacement Hairs Sims 4 Downloads Sims Hair Sims Sims 4. If you're after low-poly hairs and not just 'clay', TS3 ingame conversions aren't too bad either. Sims 3 Default Hair Replacement - Fun for my own blog, on this occasion I. Creators who do a lot of ingame conversions from TS4 like rented-Space, MDP or DeeDee can be a good starting point, and Tumblr is a rabbit hole once you start clicking links.
The problem is that there isn't much destinction between 4t2 CC conversions and 4t2 from ingame, so you'll often have to look around.