Note that the star has 6 points, the manhole cover 8 points. Here's a modern coin from Morocco, Y 20.1, ¼ rial 1321 Birmingham. However, Moroccan coins abound in stars, 5, 6, 8 and 10 pointed. Just to show that a) these parallels have great entertainment value b) you shouldn't read too much into them.

If you cannot draw living things, it is natural to fall back on geometric patterns and when you start experimenting with lines in a circle, multiple squares or parallelograms, you end up with star shaped outlines pretty quickly. The proximity of the shapes just show that they come from a similar culture. That said, it's still fun to compare.

Peter