Netorase has the exact same literal meaning as Netorare. The only difference is in the conjugation, where Neto is the verb, rare is the passive form, and rase is causative form. There's no alteration in meaning and the "ase" part means nothing by itself. Also, the word is Rase, not Ase, because the verb is Neto. Neto (VERB) + Rase (CAUSATIVE FORM).
The difference between Netorare and Netorase in japanese is the exact same as "To be done" and "To have done" for the verb "to do" in english.
That being, you have no Idea what you're talking about, at all.
Also, Netorase is not sharing, nor cuckolding, nor hotwifing. The word Netorase was created to indicate "Netorare with consent", literally.
Netorare is the passive form of Netoru.
Netorase is the causative form of Netoru.