The difference in the color being displayed in the dashboards for the CPU utilization is caused by what is being used to determine the color.
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The gauge created on the custom dashboard is using the threshold associated with the CPU Utilization metric to determine the threshold. The CPU Utilization metric is using the Intelliprofile threshold. Even though the utilization is only 13%, if most of time the utilization doesn't reach 13% a fatal severity can be reported for the utilization metric.
The color associated with the CPU utilization displayed under some of the other dashboards is based on the alarms that are currently reported for the CPU utilization for the host. For example, the spinner in the Host Details dashboard is queried from the CPU component (HostCPUs Topology) severity, so if there is no alarm reported in the CPU component, the spinner color will be green.