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The communication infrastructure of industrial plants, vehicles and many other applications must provide more and more bandwidth, sometimes with strict timing requirements for the transmission of critical data. Time-Sensitive Networking (TSN) is a set of IEEE 802 Ethernet sub-standards that meet these requirements for a wide range of applications and communication requirements. Market relevance of TSN increases in different sectors. On the other hand, SERCOS III is an established Ethernet-based communication standard, which is used in particular in the field of industrial plants. With cost and limitations of SERCOS III in mind, this paper examines the migration from SERCOS III Time Division Multiple Access (TDMA) communication on the one side to Credit Based Shaping (CBS) communication on the other side. TSN supports both mechanisms. The analyses are performed with OMNeT++ simulation models. Migration recommendations are derived from the comparison of TDMA-and CBS-based transportation of SERCOS III traffic.