You have an H8 HID 75W kit the ballasts say 75W but the bulbs have a tag on them that says 35W will they work?

You have an H8 HID 75W kit the ballasts say 75W but the bulbs have a tag on them that says 35W will they work?
No. The bulb has a maximum rating of 35Watts. If you put 75Watts to a bulb that can only withstand half of that capacity, the bulb will fail.