I believe this is the same kit with additional dorsal fin but the structure is taken from original D bubbletop.
The fundamental flaw of Hasegawa design is in bottom side of wing - fuselage fitting. There is no way it could fit correctly. It takes a lot of putty and sanding time, rescribing the panel lines and rivets to do it right. On the other hand tamiya made a very elegant design and wings are attached to the fuselage just like a real plane has (almost). Nice fitted beams stick from the fiselage and there is NO FITTINg issue of any kind.
I got Hasegawa bubbletop because it was cheap ($26) but now I would add twice as much and get tamiya instead.
Besides this issue Hasegawa cockpit is ...hmmm.. pretty spartan while in Tamiya kit you do not need anything (with exception of seat belts). Details level is absolutely great. I used Tamiya cockpit (from M kit - bacuase they provided two sets of cockpits D and M within M kit) to my Hasegawa Bubbletop