for monofilament filament, the round diameter is about 214 micron
for multi filament yarn depends to cross section of fibers and the rate of twisting
420 micron = 0.42 millimeters
Denier nylon is a unit of measuring the thickness/weight of a thinly spun fiber. It indicates the material's durability, plus the fineness of fiber filaments and yarns - both natural and synthetic. The higher the denier, the thicker the fiber; the lower the denier, the finer the fiber. per Wiki answer to what is denier.
The ballistic nylon will be a higher denier (thickness of the thread). Also will be shiny/glossy compared to the matte finish of polyester. Ballistic nylon will be much more durable and much less likey to tear or scuff. You can get higher denier polyester (900, 1200, 1800) which will be better for wear and tear. The price will reflect this however as 600d poly is low to mid price point whereas the others are higher.
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4203 = 420 x 420 x 420 = 74088000
95% of 420 = 399 = 95% * 420 = 95%/100% * 420 = 0.95 * 420 = 399
21% of 420= 21% * 420= 0.21 * 420= 88.2
35% of 420 = 35% * 420 = 0.35 * 420 = 147
420
38% of 420= 38% * 420= 0.38 * 420= 159.6
88% of 420= 88% * 420= 0.88 * 420= 369.6
420