Its not imperial blue as has already been pointed out.

Racing blue is not a verient of imperial at all - it's a different colour.

In some cases the code won't always help either as i was searching for moondust silver the other day and it found both moondust and stardust (which are different) and even some others that weren't silver.
Suppose this depends on what system is used - but on our system at work ford codes can be a pain sometimes.