Carl, between those 2 MPs, I would say Maureen resembles the sketch more. Kimberley's heavy brow ridge doesn't seem to match the sketch.
That said, the location of the UID vs details in Maureen's case do not seem to indicate a match. While she is missing from Nevada, the distance is quite far. A car trip from Maureen's home in Pahrump to the Fallon area would likely take about 5 hours, and would involve driving north. Her car was found in Inyo Cty, CA, which is over the CA border directly to the west of Pahrump, and DNA from a sex offender in Los Angeles Cty was found on her belongings inside her car.
Creepy story... And certainly doesn't negate her as a possible. I-80 is easily accessible throughout CA and will take you straight out to Fallon via Hiway 50, which intersects 80 in both Sacramento and Reno, and even meets Interstate 395/580 in Carson City, NV. The "580" moniker for the Carson-Reno segment of 395 is fairly new, having started about a year ago. The name seems to mimic the Caltrans nomenclature of "if it intersects with I-80, give it a number with 80 at the end." The naming addition happened after 395 was expanded out to reach Carson City last year, to get high-speed commuters between CC and Reno out of the small towns along the old hiway.