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@BareNecessities
Having a quick look on bikecad, the steeper STA on the Genesis adds an extra 15mm reach. That puts you almost spot on, on the 54cm sized Spa, with 577mm ETT ( If you slackened out the STA on your genesis and kept the same reach, it would end up with a 575mm ETT, rather than 560mm ).
Similar head tube lengths there too, so that's not messing up the measurements ( Genesis 155mm - Spa 157mm :-)