Based on https://isrcsearch.ifpi.org it seems that releases 442 589-2, 462 699-2 & 475 7160 are having a recording with ISRC NLA506800336 but 411 137-2 is having NLA508301814. Recording year (with Philips recordings) is usually the same as 2 digits after NLA50 on ISRC.
I would split it to 2 new recordings. ISRC can easily be added or removed (recording editor has a field for it) but acoustids can't be moved (but with Picard can be added again). I usually contact other editors only if I'm not able to fix the mistake by myself. I wouldn't mind if being contacted when there's any need for help.