Whenever I see one of these threads, I get to debate in my mind whether I want to answer, since this has all been hashed out already in past threads. I'll do the short and sweet here. SawTroll is on the right path- there was an 044 Magnum. There are identifiable traits between different 'specimens' of 044 and 440 saws. The short of it is like Niko said- there was an uprated engine featuring the 'Optimized" cylinder and piston which was part of the 044 'Magnum' designation. Other "Magnum' features included the compression release, the change to the teflon-coated base gasket, the 'lightweight' flywheel coupled with the 'intelligent' ignition module, different carburetor, different intake boot, different clutch, etc.
So yeah, there was an 044 Magnum. There was an 046 Magnum. There was a 440 Magnum, and there's a 460 Magnum.