The similar age gap and their character dynamics and toxicity(not sure) ig. I haven’t read amber alert in a long while so ion remember most parts of the story unfortunately. Also i’m not sure which one of the two stories you haven’t read but if it’s bab, I’d highly recommend you to read it just don’t forget read the TWs! (=・ω・=)
lwk second this. I would say their dynamics are pretty similar, and personality too, but not entirely. I also lwk dont rmb a lot of amber alert since its been a while but it just seemed to click ykwim. Just to lyk, bab will make u crash out multiple times and it is full of tw's so read with caution. Its RLLY GOOD but also extremely mentally taxing

yo ngl they remind me a bit of bab xie qingcheng and he yu lmao