The disagreement between the methods is increased further if the DLPNO approximation is used, which can be seen for the DKH-DLPNO-CCSD(T 0 ) + SOC method which has a maximum disagreement of 1.7 kcal/mol. However, it can be seen that the error due to the DLPNO approximation and the error due to the SOC is of nearly the same size, observed by comparing the ZORA-DLPNO-CCSD(T 0 ) distribution and the DKH-CCSD(T) + SOC distribution. While the shape of the distributions are not identical, it can be observed that using ZORA-DLPNO-CCSD(T 0 ) as an approximation to DKH-CCSD(T) + SOC would not introduce too large errors, given that ZORA-DLPNO-CCSD(T 0 ) has an error relative to ZORA-CCSD(T) of -0.39 ± 0.2 kcal/mol and DKH-CCSD(T) + SOC has one of -0.21 ± 0.2 kcal/mol. ZORA-DLPNO-CCSD(T 0 ) is therefore the most cost-efficient method for obtaining high-accuracy results.