Change a reference for a heading only if the heading itself changes.

110 20 Moskovskii novodevichii monastyr
410 20 Novodevichii monastyr (Moscow, R.S.F.S.R.)
410 20 Bogoroditse-smolenskii monastyr (Moscow, R.S.F.S.R.)
410 10 Moscow, R.S.F.S.R.‡bMoskovskii novodevichii monastyr
410 20 Novodevichy Convent (Moscow, R.S.F.S.R.)

Although Moscow (R.S.F.S.R.) is no longer valid, since the heading has not changed, do not change the references.