Yes, a lot of KS1 children are likely to have covered those topics, but not all and it's not compulsory.
So, for example, when I taught Y2 in a London school we did The Great Fire of London, because it was geographically relevant to the children, and it is an interesting topic. Likewise we always did Houses and Homes as we had the Geffrye Museum near by (which is a fantastic resource for homes through the ages). But for a famous person from history we did Neil Armstrong and the first moon landing (not Florence) as we'd chosen to do a topic on 'space', which the children loved, and so it was a better fit and more relevant.
Similarly whilst teaching Y2 in Somerset we choose not to do the Fire of London as an historical event, but did the first (modern) Olympic Games as the Olympic games were on that year, and as a whole school we were focusing on sports and 'healthy pursuits'.
As for the rest of the curriculum, the vast majority of schools follow the Literacy and Numeracy Strategy, (although again, it isn't statutory) so in those subjects there will be specific coverage of stuff by each individual year group. In Science the vast majority of schools use the QCA schemes of work (see here) which are by year group, so again, although they aren't statutory most children will cover the learning by year group as laid out there.
The subjects where there will be most variation from school to school are History, Geography, Art, D&T, and RE because these are generally used as the basis for 'topics' and schools may well choose to do different things. In fact there has been a big push recently for schools to move away from the rather dry schemes of work that everyone uses, and customise their own curriculum in more creative ways. So the variation should be happening more and more. HTH