i bought 403 TMS chip, but when i pulled my ECU its a 402. From all the stuff i've read the 402 and 403 use the same base ECU. Can i use the 403 chip in the 402 board. or should i get a 403 ECU, chip it and stick that in the car. or should i sell the chip and go hunting for a 402 chip

also, anyone had any luck with those $40 ebay chips im guessing they are just copies of one of the performance chips