Given your description of these cats having sand-colored fur and very large ears, which are distinctive traits of street cats from Egypt, it seems you are referring to what are often called Egyptian Street Cats or Nile Valley Egyptian Cats. These cats are not a recognized breed but are characterized by their adaptation to the harsh, sunny environment of Egypt, which influences their appearance:

Sand-colored fur: This color helps them blend into their environment, providing camouflage in the sandy, sunlit areas typical of Egypt.

Large ears: Large ears are beneficial for heat dissipation in the hot climate and also enhance their hearing, which is crucial for survival on the streets.

These traits distinguish them from typical domestic shorthairs found in Western countries, where the environment and historical breeding practices have led to different physical characteristics. Egyptian Street Cats are resilient and have adapted over time to the urban and rural landscapes of Egypt, making them uniquely suited to their environment.

So, considering your familiarity with these cats and the traits you've described, the cats in the images from the X posts are indeed characteristic of Egyptian Street Cats, which are known for their survival skills and distinctive appearance tailored to their native habitat.