(i'd say that Kiffa beads are Mauritanian powder glass beads carefully formed around a core).
the decoration on the surface of your Ghanaian powder glass beads may be something more like paint or nail lacquer or so-called "enamel" paint such as used by model makers. you might test that by scraping on an inconspicuous spot. it could have been added at any other moment before the necklace was assembled.
i know there are creative projects in Ethiopia and many other parts of East Africa making jewellery in order to help women get out of poverty, and it includes adapting traditional components and making beads...