To reveal the correlation between the anisotropy of electromagnetic absorbing metastructure and the radar cross section (RCS) of its curved components, the typical anisotropic hexagonal honeycomb (HH) metastructure and isotropic sheet gyroid (SG) metastructure are systematically studied. Both conformal mapping and non-conformal mapping methods are employed for designing the conformal curved components. These designs are compared using simulation and microwave anechoic chamber testing to evaluate their RCSs. The results indicate that the RCS of isotropic sheet gyroid curved components is insensitive to design methods, exhibiting strong design method and absorbing robustness; however, the RCS of anisotropic hexagonal honeycomb curved components exhibits strong dependence on design methods. Compared with anisotropic structures, metastructures with electromagnetic isotropy have significant advantages in achieving wide-angle and robust low-scattering characteristics of curved components, with lower dependence on design and processing. This study provides important design guidance for developing high-performance radar low-scattering components.