Hattori is not a traditional kitchen knife maker- he had a great style with fighting and hunting knives-I still like and use the fh series- but over the years my tastes evolved to more the traditional styles...
Lol hahahah they are different. Shigefusa is forged by hand in to one piece include bolster. But heckle is cut from one steel. And just welding the bolster to the blade. So that just cheap labor.
Since this thread is about Hattori, I'll just add that Shiges and Hattoris are both over-rated imo...and I too would prefer a Shig but with rat tail tang w/ Shig ho wood handle vs super small handled (read uncomfortable) western style.