[en] Theoretical studies in the intensity-borrowing sudden approximation are reported of inner-valence-shell photoionization cross sections in N₂ and CO. The required ionic-state energies and spectroscopic amplitudes are obtained from appropriate Green's-function and configuration-interaction calculations, and previously devised Stieltjes-Tchebycheff moment-theory techniques are employed in determinations of corresponding continuum dipole transition moments in the static-exchange approximation. Comparisons are made of the Green's-function calculations in the two-particle-hole Tamm-Dancoff approximation with wavefunction results obtained from single-excitation and polarization configuration-interaction calculations. Detailed descriptions are given of the calculated spectroscopic intensity distributions and of the hole-particle configurational compositions of the corresponding inner-valence-shell ionic states, and comparisons are made with previously reported wavefunction studies in N⁺₂ and CO⁺. Spectroscopic assignments are suggested on basis of the present calculations for the strong features observed recently in higher-resolution inner-valence-shell photoelectron spectra. The corresponding calculated partial-channel photoionization cross sections for the designated C² Σ⁺sub(u), F ²Σ⁺sub(g), G ²Σ⁺sub(g), and (2sigma^-1sub(g)) ²Σ⁺sub(g) bands in N₂ and C ²Σ⁺, D ²PI, F ²Σ⁺, G ²Σ⁺, and (3sigma^-1) ²Σ⁺ bands in CO are found to be in good quantitative accord with dipole (e,2e), (e,e + ion), and synchrotron-radiation studies. (orig.)