These 2 tapes are used at different times of the process of building your wooden surfboard and should not be substituted with inferior quality tape.
The yellow tape is used when gluing the skins together and stopping resin from running through holes.
The brown tape is for taping (aka strapping) the nose and tail into position while the glue goes off, it is also used in the vacuum process to pull the skins down onto the rails.
You'll receive 2 rolls of yellow and 1 roll of brown tape.