@dave I think they are meant to be the same size (size of a poker chip). I just checked, all mine except 2 are the same diameter. Then at least 2 different thicknesses. I suppose if the diameter is the same for all/most, it would work.

I think various manufacturers use different width. And then chips have been around long enough and enough people donate their chips back that you get a bit of a mix and match. The two of mine that are diff size from the rest must just not be "standard" 🤷