to answer my own question yes it is. If this guy used it for this. I'll be fine.
"Reassemble with fresh seals, usually you can reuse the pistons unless they are deeply pitted. If they are you can often clean the pistons with alcohol or chemicals to clean off the brake fluid residues, then apply a little JB weld epoxy to the pits. Get it as smooth as possible then let it dry overnight. Carefully sand down the excess until you get a smooth surface, then reinstall the pistons and the rest of the parts. Be sure that the master cylinder is clean, especially in the floor of the reservoir where the tiny bleed hole is located. Bleed carefully and go riding again."