Not really an accurately worded question.

Wales was absorbed into England, and part of England, and was only technically recognised as a country within the UK separate from England relatively recently.

Scotland was never part of England and was a country in its own right. It had been independent of England for a thousand years until a Scottish King took the throne of England - which united the Crowns in a Personal Union.

When Scotland and England eventually united, they did so as a union of equals. Scotland retained its own legal system, it's own education system and judiciary.

England never conquered Scotland in the way they did with Wales. Scotland wasn't absorbed into England. They joined to create a new State together.

England does not equal the UK.