Is there a legal difference between the two?

The Civil Partnership Act 2004 gave same-sex couples the rights and responsibilities similar to those in a civil marriage. Civil partners are entitled to the same property rights, the same exemptions on inheritance tax, social security and pension benefits as married couples. They also have the same ability to get parental responsibility for a partner's children as well as reasonable maintenance, tenancy rights, insurance and next-of-kin rights in hospital and with doctors. There is a process similar to divorce for dissolving a civil partnership.