Fragarach Fusion Questions

[Korimaxx]

Okay, so I am somewhat new to the forums so apologies if this is in the wrong place or if someone had already asked this. (I couldn't find anything so...)

Anyway, I have a question about fragarach fusion, specifically fusing to fragarachs together.
I know you can fuse two Supernal Aug X frags or whatever. What I want to know is if you can fuse frags of other classes together. Like for example a Frag Bow with a Frag Dagger (For the sweet criticals)

I don't want to invest working on a frag that I can't fuse into my bows, so I wanted to get assurance on this matter.

[xPrototypeT]

You can't, your class only.

[Disguy]

if you can't equipt it you can't fuse it