[3] Well known complexes such as Ferrocene and Uranocene also serve as examples where LBN and coordination number differ.
The usefulness of LBN to describe bonding extends beyond just sandwich compounds.
Co(CO)3(NO) is a stable 18-electron complex in part due to the bonding of the NO ligand in its linear form.
The donation of the lone pair on the nitrogen makes this complex ML4X, containing 18 electrons.
The traditional coordination number here would be 4, while the CBC more accurately describes the bonding with a LBN of 5.