I don't think these are legal terms of art, so I am not going to try to pretend they are, but I think that the South Asian Legal Clinic of Ontario, for example, has done considerable work to raise awareness around these issues, and I commend their work on it to you.
I think the distinction they draw is that forced marriage is not the same as an arranged marriage. In an arranged marriage, both parties give their full and free consent, while in cases of forced marriage, one or both of the spouses do not consent. People of all cultural backgrounds have experienced forced marriages. In Canada forced marriages sometimes happen within newcomer communities, and the clinic goes on to talk about it as a form of family violence. They certainly do draw a distinction between arranged marriage and forced marriage, I think with a view to not letting the spectre of forced marriage become an excuse or a device to reduce or refuse the family reunification of people from cultures where arranged marriages are practised.