What's the difference between lusterless and lustreless?

Lusterless

Definition:

Example Sentences:

(1) The nail plate is generally thinned, the surface ridged and lusterless, and the lunula decreased in size.
(2) This syndrome is characterized by the following cutaneous anomalies: congenital ichthyosiform erythroderma with thick, adherent hyperkeratoses; widespread atrophic skin lesions discernible after the first weeks of life; patchy alopecia; coarse and lusterless hair; onychoschisis.
(3) Patients with idiopathic hypoparathyroidism frequently develop ectodermal disease, including dry, rough skin: coarse, brittle hair; and lusterless, distally split nails.

Definition:

Example Sentences:

(1) He remembers having to impress his credentials on a casting team who’d definitely never seen Son of Rambow or Wild Bill , and had probably skipped the lustreless Narnia 3 as well.
(2) What it may do, should a consensus be reached, is give momentum and a patina of success to an otherwise lustreless conference.
(3) Results showed that apart from caries (87.5%), most prevalent clinical signs of malnutrition were dermatosis (13.4%), follicular hyperkeratosis type I (13.2%), nasolabial dyssebacea (7.9%), lustreless hair (7.7%), angular stomatitis (4.4%) and cheilosis (2.7%).
(4) Experiments carried out on 64 knees of 32 Lein sheep with superficial and deep chondral defects of the patella and femoral condyles covered by autogenic fascia lata grafts indicate that under active motion and load the grafted tissue after 6 weeks is thinner, fragile and lustreless.
(5) The clinical picture showed brittle, lustreless, fallow hair.
(6) Results revealed that L-Feb-75 strain represented thin membraneous growth from about 20th week and it crept up the culture tube wall at about 30th week of incubation at 37 degrees C. L-Jun-75 strain, on the other hand, exhibited numerous, white and rough colonies of submiliary size on various places of the lustreless, thin membraneous structure at the inoculation site.