These are both Revell 1/144 737-800 kits but with a change of decal.
The ex-XL aircraft is one I flew on from Bangkok to Chiang Mai about 10 years ago and this was one of two XL '800s that Nok leased for evaluation purposes. The decals are all home made using an inkjet printer and Bare Metal decal paper.
The more colourful one is one of the current Nok '800s in 'Nemo' colour scheme. The decals here are from the notorious Gio range, though I chose to hand paint the white/black on the fuselage rather than use the decals. Also be aware that on the decal sheet, the Nok beak is mirrored for either side of the airframe, whereas in reality it is always facing to the left; and the white Nok phone number/web address decals are undersized. Also on this model, I made my own fan decal on plasticard for the inside of the engine nacelles rather than using and painting the kit part.