Somewhere in 2007 the ADR's forced car manufacturers to build in an error to the speedo to comply with a formula. Works out to be about 106 on most cars speedos after the change will give you a true 100.

Before they would have had to comply with this Subi speedos were pretty well spot on.

If you want to check RPM then check it against a GPS with both cars. If you have one of the newer inaccurate ones it will read differently to an earlier one.

Also box and diff ratios did change through the years.

The 06 WRX also revved higher than the 06 STi with both in top gear. The STi was around 2500-2600 from memory. When I test drove the WRX before getting the STi I'm pretty sure it was 3K+

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Stoner & Webber 2011 World Champions