English toffee and butter toffee are often used interchangeably, but there can be subtle differences. English toffee is typically hard and brittle, made primarily from butter and sugar, and often coated with chocolate and nuts. Butter toffee, while also made with butter and sugar, sometimes has a slightly softer, more chewy texture. The main ingredients are similar, but the cooking process and proportions can vary, leading to these textural differences.