While a compressor spool doesn't have the energy of a fan disc, a failed spool is effectively a burst rotor.
The HP compressor will be doing upwards of 10,000rpm, a whole lot faster than the fan which would be getting up to 2,500 rpm. The compressor has a smaller diameter, but has several stages on the same disk to save weight but increases the load on the disk, etc. Working it out is complicated.
Whatever it works out to be, I think one thing we can reasonably say right now is that the compressor disk in question is not strong enough; bits of it were on the tarmac which is exactly where they shouldn't be.
Another way of looking at it is that there's several tens of thousands of horsepower (tens of megawatts) going into the compressor. A good size power station turbine is only 500MW; these large turbofan engines are using the equivalent of a large fraction of your average power station just to run the compressor, never mind propelling the aircraft forwards.
When that goes significantly wrong there is going to be a one helluva bang. Of course the reason we're more used to the idea of turbine failures is that, whilst they're under a similar rotational load (same RPM), each turbine blade has a much, much higher aerodynamic load and runs very hot too.
Interestingly the RPM of these turbofans is far lower than the turbocharger on a car, which may get up to 100,000 RPM. Of the millions of those that have been made one or two must have broken up. They're a lot smaller and lighter, so keeping the bits inside is going to be much easier.