Impex question

[Scandal]

Hello!
I have a question about Impex.
I test the merging of two vbulletin databases (vb 3.8.6).
In the Select System of Impex there are the choices:
Vbulletin (3.0.X-3.5.X)
Vbulletin (3.7.X)
and
Vbulletin 2 (2.3.10)

Why there isn't the choice "Vbulletin 3.8.X"?

In the "Select version and product to export to" of Impex, there is the choice "Vbulletin 3.7.X & 3.8.X"

Will I have any problem if I choose "Vbulletin (3.7.X)" as the "Select System"?