Industry 4.0 has the potential to transform the service sector, enhancing efficiency and quality. While its impact on manufacturing is well-studied, its implications for services remain less explored. To address this gap, we conducted a scoping literature review with two main objectives: 1) to investigate the specific ways Industry 4.0 has influenced the service sector and 2) to compare and contrast the implementation of Industry 4.0 across manufacturing and service industries. Our paper aims to analyze the applications of technologies like AI, Cloud Computing and Big Data analytics in the service industry, providing insights to develop roadmaps for leveraging Industry 4.0 concepts effectively. We reviewed articles published within the last five years from Web of Science and ScienceDirect. From a pool of 71 eligible articles, data were extracted and analyzed using descriptive and quantitative methods. The findings lay a foundation for future research on Industry 4.0's impact on the service industry, known as Service 4.0.