The A9010 (UK) is specially tuned for the UK and not simply a standard A9010 minus the DAC. There is a review by David Price in the latest HFC as well, and it is very positive. The adaptations include changes to choice of capacitors and the heatsinking and, as DP says in his review, the whole idea is a hark back to the 90s when Japanese amps like the Pioneer A400, Kenwood KA3020SE and various Sony models were specially tuned for UK ears.
As for its relationship to the A9030, it seems there are substantial variances in sound between all 3 affordable Onkyo models if you take the reviews into account, so you pays your money and you makes your choice!