What are the similarities between animal rights and animal welfare?

The similarities are fairly superficial. Both animal welfare and animal rights are concerned with how animals are treated and advocate for ending abusive practices such as dog fighting.

However, the two disciplines are very different in their philosophies and their ultimate goals. Animal welfare focuses on the ethical integration of animals and the use of animals into human society - while living, animals should be subjected to the minimum amount of discomfort. Animal rights, however, focuses on the ethical and moral viewpoint that animals should not be used or integrated into human society, and that animals are morally equivalent to humans in terms of bodily integrity, right to life, etc.