Someone mixed up the cast of two episodes

As written in the subject above, I noticed that someone mixed up all actors except all persons credited as 'self' in two episodes of the series 'XY gelöst'.

In Episode S5E1 'Mord im Karneval' ( https://www.imdb.com/title/tt43595446/fullcredits/?ref_=tt_cst_sm) all actors (except 'self') belong to the Episode S5E4 ''Verhängnisvolle Vergangenheit' (End credits at 44:10 on ZDF site https://www.zdf.de/play/dokus/xy-geloest-106/verhaengnisvolle-vergangenheit-true-crime-reihe-mit-sven-voss-100?staffel=5).

And in return all actors listed in Episode S5E4 'Verhängnisvolle Vergangenheit' (https://www.imdb.com/title/tt43648120/fullcredits/?ref_=tt_cst_sm) except 'self' belong to Episode S5E1 'Mord im Karneval' (End Credits at 44:27 on ZDF site https://www.zdf.de/play/dokus/xy-geloest-106/mord-im-karneval-true-crime-reihe-mit-sven-voss-100?staffel=5).

All role names are correct, but are the wrong episode.

Do I have to delete and re-add all names one by one or is there another solution?