Catalysis of the reaction: UDP-3-O-[(3R)-3-hydroxytetradecanoyl]-alpha-D-glucosamine(1-) + an (3R)-3-hydroxymyristoyl-[acp] <=> UDP-2,3-bis[O-(3R)-3-hydroxymyristoyl]-alpha-D-glucosamine + H+ + a holo-[acyl-carrier protein]
Catalysis of the reaction: UDP-3-O-[(3R)-3-hydroxytetradecanoyl]-alpha-D-glucosamine(1-) + an (3R)-3-hydroxymyristoyl-[acp] <=> UDP-2,3-bis[O-(3R)-3-hydroxymyristoyl]-alpha-D-glucosamine + H+ + a holo-[acyl-carrier protein] (en)