The sleds are supposed to be compatible between the Rio Car and the Mark 2. So if you're wondering whether the pinouts were changed, no, they shouldn't be.

The next step is to be sure, by temporarily connecting the new Rio's ignition and constant power sled wires to a 12v power source and seeing if the player boots that way. If not, then it's got something wrong internally that needs to be repaired.
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Tony Fabris