The movies share a similar aesthetic and feel. Mr. Brown in Reservoir Dogs exists in a world filled with violence, tension, and dark humor. Pulp Fiction also has these elements. The use of music in both movies is also characteristic of Tarantino's style. For example, in Reservoir Dogs, the music sets the mood for the different scenes, and in Pulp Fiction, it adds to the overall atmosphere of the movie. Mr. Brown's role within his group in Reservoir Dogs can be compared to the relationships between characters in Pulp Fiction, like the relationship between Butch and Marsellus Wallace, which are full of power dynamics and unexpected turns.
The overall tone of Pulp Fiction is a mix of violence, black humor, and pop - culture references. Mr. Brown in Reservoir Dogs is part of a group that also has a somewhat similar tone. There's a sense of danger and unpredictability around his character which is also present in Pulp Fiction.
There are definite connections. Both films showcase Tarantino's nonlinear storytelling and have elements of crime, violence, and dark humor. Also, the characters in both often have complex and morally ambiguous motivations.