Thing 2 on the left, Thing 1 on the right.
Teeth update: Thing 1's upper left molar is 1/2 out, and her the upper left is starting to poke through. The 2 lower molars are not far behind. All four of Thing 2's molars are also erupting.
Thing 1 now wears a pink enamel flower earring and Thing 2 wears a blue one (thanks Nana). With the color contrast, we're hoping Curious George would now be able to tell them apart (though it's difficult at times, since their hair is so long they cover their ears).