Hey Rob!
Good start for an exercise
N. kongkandana is for sure N. kongkandana because I guess - I hope - you collected seeds or cuttings from the areas where we found this species.
About unknown 1,2,3, we should understand if they are natural hybrids or if they were produced in a greenhouse. Unfortunately, many new hybrids have been made in captivity. If we don't know the province of origin of the mother plants, we can't know what they are. You should ask the seller if the seeds/cuttings of n. 1,2,3 have been produced in captivity or if they are from the wild.
UPDATE: giving a better look, it seems to me that unknown 1 is N. andamana x mirabilis var. globosa, unknown 2 is N. suratensis from Kanchanadit and unknown 3 is a man-made hybrid.