I need to replace my 5.5KW VFD for a different unit.
I'm offered a 7.5KW VFD for the same price as the 5.5KW VFD.
The motor is 5.5KW. Can the 7.5KW VFD be used with my 5.5KW motor? Or is it better to replace with a matching unit?
No, you don't have to match them, a 7.5kW VFD will work perfectly fine for a 5.5kW motor (or even a 1.5kW motor as long as it has the same working voltage).