In 2008, the highest catalog value for any of the ten varieties, mint or used, was $2.50 and the lowest was $0.20 -- generally, they are worth more postally used, especially on cover.
I don't know which ones you have, because Scott does not list the colors in an understandable way. Color is the only means of identification if you don't read Thai.
Looking at the Wikipedia page on Thai numerals and at the Scott catalog description, I would say that the one on the right is Scott O5, 1 Baht silver and carmine rose and the on the left is Scott O6, the 2 Baht bronze and carmine rose.
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