one is constantly thinking about how you eat or emotionally eating (kinda) the other is similar to OCD

3

I think an eating disorder means passing a certain threshold of disordered eating and it becoming disruptive to your life/health

2

An eating disorder requires a certain amount of weight loss and obsession, whilst disordered eating is a less severe version of an eating disorder (not saying it isn't serious, as it can easily develop into an eating disorder, an eating disorder is just an amplified version of disordered eating)

2