Its hard to say without knowing what case your talking about. While everyone references radiators by fan size they are actually longer then stated. At one end you have an end cap that normally sticks out about a 1/2" past the fan and the other end normally sticks out about an 1 -1.5" for hose mounting.
Most of the time yes but not guaranteed. To check compatibility enter your case and AIO cooler information into PCPartPicker, it is usually very good at flagging incompatibilities.
https://pcpartpicker.com/
Its hard to say without knowing what case your talking about. While everyone references radiators by fan size they are actually longer then stated. At one end you have an end cap that normally sticks out about a 1/2" past the fan and the other end normally sticks out about an 1 -1.5" for hose mounting.