Yeah I vote for them being 2 different products. For myself, Malwarebytes is best to be used as a second opinion.
One day I had a warm fuzzy feeling and bought the pro version of malwarebytes as a thank you for them giving me so many wonderful years. And wouldn't you know, they have changed it from one lifetime payment to yearly? Got in just under the gun.
Also just found out that the Bitdefender intrusion detection has never worked correctly in a 64 bit Windows. So I downgraded BD to 2014 and turned Malwarebytes on, full blast, until I decide what I want to do. Yes it has been handy over the years.