They are the same.
no
1.58kg per metre
Grams are a measure of weight, a square meter is a measure of area, and a cubic meter is a measure of volume. These are not comparable.
grams per square meter
500
24kn/m3
0.618
3 KG / Meter
0.887 kg per m
To convert fabric weight from ounces per square yard to grams per square meter, you can use the conversion factor of 33.906. Multiply the weight in ounces per square yard by 33.906 to get the weight in grams per square meter. This conversion factor accounts for the difference in the units of measurement for weight and area between the US customary system and the metric system.
Specific weight is the weight of the material per unit volume. Water has the specific weight of 62.43 pounds per cubic foot or 9.807 Newtons per cubic meter.