[Printrbot Metal Simple + Cura 2.3 Beta + Pronterface from Cura 15.04.4]

Yes, exporting the gcode from Cura 2 to Cura 15 totally works. Sadly it looks like if you have any new features turned on like some of the fancy new infills it just reverts back to the classic grid style infill.

[Does Cura 2 have pronterface?]

I can't seem to find the setting and if its not then it makes printrbots almost unusable with this program.