The Cobra's aren't made with resin and aren't "cured" - they are made with a polymer powder that gets fused together. I wouldn't trust any resin printed cages as biocompatible resin is a lot less readily available than printing in the Nylon PA12 that is standard and anywhere doing knockoff resin printing is likely cutting corners as much as they can.
The dye allergy is quite common and isn't exclusive to cages/plastics. People experience the same reaction with cosmetic items that use similar dye bases.
If you are allergic to the black Cobra's, I have an undyed version of my Evo for this specific reason - which might I add is the better cage anyway
However, if you know what Cobra cage you like, I believe the pink cages they just released shouldn't have the same issue as the allergy is typically with a chemical in the dark dyes.
Authentic Cobras only come in black and pink. I think they might have tested out a white cage way back but it never made it into full time production. The rest are knockoffs so it'll be a mixed bag on the quality of them. Also the cobrachastity site is a scam knockoff site so don't order from them. They only sell on their site (kink3d.com) and through a handful of established companies.