It's as Roving Gecko posted it, a 6 instead of a 4 in the part number.
As I recall it's the same size, worryingly (or not) the heatsink is the same for both.

Mark
G68, baby Genelecs, Humax Foxsat, Oppo+Vanity93, Toshiba HD-A35, Pioneer CLD-925 + Meridian 519, various other random bits and bobs
Got a black G08.2 you want to sell?