Ok, on Icarus the front 'cap' is engraved and cone shaped whereas on Record OR it's more rounded, without the engraving. Also the bolts are engraved on the Record and recessed into the cap.
The main difference is the pivot, which uses a more complex bushing system on the Record.. the cap screws up against the canti's arm to hold it in place and acts more like a thrust washer.
Originally Record brakes used the conventional pad mounting hardware seen in the bottom pic, but later models of both Icarus and Record had the ball-socket/ring system.
Interestingly, the brakes in the last pic are prototypes, -they were never produced without cutouts..
Icarus are still superb canti's, just slightly more conventional. They work great and have a finish to die for - no mistake!