First, different meanings:
1, housewarming: people move or get promoted.
2. Relocation: Relocation.
Second, the source is different:
1, the joy of moving: Guo Moruo's "Hong" Chapter 4 Chapter 3: "The big man is too inconvenient to move soon."
2. Relocation: People's Literature, No.8, 198 1: "Our house will be demolished, and the whole hutong will be relocated to build a building."
Third, the emphasis is different:
1, housewarming: Congratulations, congratulations on moving or promotion.
2. Relocation: Families, factories, shops and institutions move from one place to another.