Cold water leaks on bathtub valve. I need to rebuild the valves. Is there a kit to do both hot and cold? And I do not know the brand. 2 separate handles for hot and cold

See the image below does your valve looks like this I have removed the diverter form the valve, if it looks like this you can replace the washer at the end of the stem, first shut the water to the tub remove the stems assembly inspect the seats inside the valve for scratch if you see any replace the seats also. I have also attach the images for the tools, good luck.

John