The electron-phonon coupling for Cr3+ in different oxide host lattices (MgO, α-Al2O3 and LaAlO3) was probed by performing temperature dependent line broadening measurements for zero-phonon emission lines of single ions and exchange coupled pairs. No differences in electron-phonon coupling were found comparing the results for pairs and single ions in α-Al2O3 (3NN and 4NN pairs) and LaAlO3 (NN pairs). In Cr3+ doped MgO (Cr3+-VMg-Cr3+ pairs), it was found that the electron-phonon coupling strength parameter is larger for the pairs than for the isolated Cr3+ ions. This is probably due to changes in the surroundings of Cr3+ by local charge compensation by a magnesium vacancy, and not to interaction between the Cr3+ ions.