Its going to be hard to just look at them and get a correct answer. They resemble a few different woods so you might have to use the feel and smell test also. lol
Of course walnut is softer and will smell like nothing else but walnut, and you will probably be able to dent them with your fingernail. If its harder it could be a rosewood species. I have some from India (if I recall correctly) that was lighter tan and looks like that. Of course they would make a higher pitched sound when you bang them together and be more dense and oily compared to walnut, which is dryer. Good luck!