I don't think "get along" may be the right phrase so much as healthy co habitation. While both are very active species, each has a rather different temperment. The Lunare especially while small will be very inquisitive, playful and mischeivious. The bird wrasse on the otherhand is very timid, much like tangs believe it or not which would mean a good deal of continued stress. As the Lunar ages, they also become somewhat destructive and aggressive towards other species, especially clowns. Both will be a concern with mobile inverts overall but especially the Lunare with snails &decorative shrimp/crabs. Unless this is a very large (long) tank, I don't think it would be a wise choice. You can expect either to get at least 9" in a few short years if purchased as juvi's. They will both grow to 5+" in the first 2 years (captive life) depending on diet/care. I personally do not think bird wrasses do well in captivity and of the two, the Lunar would be the best solo choice. Really depends on the tank type you have and the other inhabitants kept.
Cheers
Steve