For two photons, which of the following is true?

The linear momentum of a photon is a vector quantity given by $\vec{p} = \dfrac{h}{\lambda} \hat{n}$, where $\lambda$ is the wavelength and $\hat{n}$ is the unit vector in the direction of propagation.

If two photons have equal wavelengths, frequencies, or energies, the magnitudes of their linear momenta are equal, but their directions of propagation may be different. Therefore, they do not necessarily have equal linear momenta.

If two photons have equal linear momenta, their momentum vectors are identical, which means the magnitudes of their momenta are equal ($|\vec{p}_1| = |\vec{p}_2|$).

Since $|\vec{p}| = \dfrac{h}{\lambda}$, equal magnitudes of linear momentum imply equal wavelengths ($\lambda_1 = \lambda_2$).