If you thought, as I do and have mentioned previously, that Danish Royal heraldry was verging on the boring, wait till you see Belgium's! To give it its due, Continental European heraldry has a history of not differentiating between the generations and even siblings. And Norway's Royal Family is even worse as there is absolutely no difference in any Member's Coat of Arms at all!
The Coat of Arms for the whole of the country is basically the golden Lion on a black background of the dominant province of Brabant which had come to the fore in a previous revolution against Austrian rule before Belgium became Belgium. Having said that, the history of Belgium and the Low Countries is a little too complicated to start on here. It is therefore, though, not surprising that the heir to Belgian throne is called Duke or Duchess of Brabant.
The above Coat of Arms is technically not royal as it is the Grand Coat of Arms of Belgium, i.e. the country and not any individual. I have included it here as it at least provides a bit of variety and colour with the flags of the Nine constituent Provinces. It also emphasizes that the Belgian Sovereign is is King of the Belgians rather than King of Belgium, indicating a popular monarchy linked to the people of Belgium, rather than a standard constitutional or absolute monarch linked to territory or state. This follows a pattern used by the restored French monarchy after the Revolution.
Having said that, there are currently two Kings in Belgium. Even after his abdication in 2013, Albert II still retains his regal title and, whilst his son is HM King Philippe I, King of the Belgians, is apparently HM King Albert II of Belgium. This is purely because 'of Belgium' is the Royal family's surname, changed, like the Windsors of the United Kingdom, from the Germanic Saxe-Coburg and Gotha at the time of the First World War. King Albert II's Coat of Arms remains, unless otherwise informed, exactly the same and is (somewhat annoyingly) undifferenced.
The Heir to the Throne, the Duke of Brabant, usually has a slightly simpler version of the monarch's Coat of Arms. However, the Coat of Arms for the present Heir has not been finalised. Firstly, the person is the first female Heir Apparent in Belgium's history, Princess Elisabeth. Secondly, she is still a minor. As such, she is presumed to use the version that all Belgian princesses use, namely the Royal Coat of Arms on a Lozenge and ensigned by the Royal Crown. Pure and simple. As well as Elisabeth, this Coat of Arms is used by her Aunt Astrid and her sister Eléonore.
All princes are now assigned the Royal Coat of Arms (minus the Scepters, which are reserved for the monarch only) differenced by a golden Label. This includes Princes Laurent, Gabriel and Emmanuel. King Albert II, as Prince of Liège before his accession, bore these Arms. In previous generations there was a less structured system of labels for princes - mostly red and with various, relatively unimaginative marks of Difference - but nowadays there is only the Label.
The subject of the tradition of everyone in a certain family having the same Coat of Arms is obviously open to debate. personally I find it not only a bit boring but potentially confusing, especially in a Royal Family. The Belgian Royal Family does have Standards (by which I mean flags) but they only appear to be assigned to the top royals and, again, are very similar to each other, only being differenced by the Royal Monogram in the corners...
The gallery below is relieved in its relative monotony by the Coats of Arms of the Royal Spouses.