Is there a way to detect strange quark stars even though they look like white dwarfs?

Matter is built around quarks, forming the nuclei of the atoms and molecules. While there are six types of quarks, regular matter contains only two: up quarks and down quarks. Protons contain two ups and a down, while neutrons contain two downs and an up. On Earth, the other four types are only seen when created in particle accelerators. But some of them could also appear naturally in dense objects such as neutron stars.

Source:
https://phys.org/news/2020-12-strange-quark-stars-white-dwarfs.html