Yes, the store in Central World is another branch of the same group as at MBK. The Thaniya Plaza store may be downsizing or getting phased out. It definitely has the smallest selection of the three. Although the branch at Central World may be physically better, I think the MBK branch still has the best selection. Lots of Herpa, Dragon Wings, Gemini Jets, etc. etc. etc. 1:500, 1:400, 1:200, and other scales.

They have a loyalty program. Once you spend 5000 baht, you get a 10% discount on future purchases.