Civil partnership and same sex marriage is similar in ways such as both sharing property rights, pension benefits and the ability to obtain parental responsibility. However, there is a few differences between the two.
In a civil partnership, you cannot rely on adultery to end the partnership, whereas in a marriage you can. If a couple decide to end their marriage it is by obtaining a decree absolute and differs to a Civil partnership, as they would need a dissolution order. Another difference, is that in some countries a civil partnership is not legally recognized, unlike a marriage which is legally binding in all countries.