IMCQ, sorry, but I am not entirely sure what you would like to know. With regards to the first question, I thought, well, these are really different knives than the FG. The FG being a double guarded, bilaterally symmetrical handled modern American styled combat knife and all. All three have completely different Busse handle approaches. New SF, NF, and TG handles respectively. Then I got to thinking about the blades, themselves, and saw the similarities there. In fact, when thinking about the HR2 and the NFFSH and a possible purchase, I decided they were too similar in the blade to justify both, and then couldn't shake my innate dislike for CBT and that killed the purchase of either one for me.
So perhaps you are interested in the subtle differences between the two very and three somewhat (with respect to the FG) similar blades?
Then I read the second question and at first it sounded like you were asking about the differences between the numerous TG variants? But then I read it a few more times in context of the first question and decided that probably you meant that if anyone owns the HR2 and a NNFFSH and ANY TG variant, that you would love to hear their comments on the differences therein. Again, likely focusing on the differences in blades given the obviously different handle styles, of which you already own two.
I am not trying to be a pedantic jerk (though I may inadvertently be one), and apologize if I come off that way here. Just trying to help clarify so you get some responses. Or perhaps everyone else knows what you meant and it is just me. Definitely possible!