I have tried searching this question many different ways but to no avail. My instinct and common sense say the processing is probably exactly the same but I would like to be sure.
Parchment paper for cooking is coated with silicone. Therefore, most traditional writing implements would not even be able to leave a permanent mark on it.
In addition to the coating, at least one brand says it uses additional manufacturing steps to strengthen its cooking parchment paper:
A spokesperson for Reynolds Consumer Products, says that the company’s parchment paper is pressed into a sheet, then dipped into an acid bath, washed, and “passed over a series of hot rotating drums that realign the fibers and give the paper its strength,” before the silicone coating is applied.