What is difference between King and Queen hassaurs please

Essentially the only difference between the Kings Royal Hussars (KRH) and the Queen's Royal Hussars (QRH) is their uniform and cap badge.

Both Regiments are part of the Royal Armoured Corps (RAC) and both Regiments currently operate the Challenger 2 Main Battle Tank. Both regiments are also based in Tidworth.

The QRH is the most senior armoured regiment in the British Army and wear the Irish harp as their cap badge. The KRH wear the distinctive crimson trousers when parading at formal occasions and their cap badge is the Prussian eagle awarded by the crown Princess Frederica of Prussia (modern day Germany).

There is loads of information available on the internet about both the QRH and KRH.