I remember changing a set on an edger many moons ago. I think they're the same size as the larger saw blades because we borrowed a wrench from a guy that has a circle saw and the wrenches fit both edger and sawmill blade. We broke 2 wrenches even after using heat. I don't think they'd ever been changed.
If I had to guess, I'd say they're no different than sawmill bits and shanks but I don't know for sure because I've only done the one edger and no sawmills, simply based on the fact that the wrenches were identical, so if the shank wrench fits the edger and the sawmill that should mean the bits are similar too, right? They're still going lengthwise down the grain (but now in flitch form going through the edger) just like the sawmill would be doing going down the log.
With my superior powers of intellectual prowess
, I deduce the bits to be the same......now I better go lie down before I fall over.
P.S. I don't think I have superior anything. Just trying to get a chuckle maybe...