I certainly think an INFP and ENFP have more dating compatibility that most other pairings for these groups...
So if it makes you both happy, go for it.
But my experience has been that INFPs seem to fit the friend category better for me. While INFJs and INTJs fit the dating category better.
My two best friends in the whole world are INFP. One is male, the other female. But it's like we are so much alike that it'd be like dating myself.
With INTJs and INFJs we the same in some ways and different in others... but the mix is just right. In other words, as a couple the ENFP and INxJ mix covers most of the bases. This benefits us both. But an ENFP/INFP couple would be so much alike that there would be glaring holes in our competency as a couple operating in the world.
For example, it'd be a freakin' miracle if either of us ever got anything done... like ever. Who'd be on time to events. Who'd find the other's cell phone when it was misplaced. Who'd remind the other to lop off some of the options we'd both see.
Hope this makes sense.