[out:xml][timeout:3600]; ( relation(113521)['wikidata'='Q1024085']['wikipedia'='en:El Sobrante, California']; relation(13635626)['wikidata'='Q1863076']['wikipedia'='en:Blackhawk, California']; way(27444599)['wikidata'='Q49472069']['wikipedia'='en:Albany Hill']; ); (._;>;); out meta qt;//['wikipedia wikidata mismatch']
[out:xml][timeout:3600]; ( way(157449985)['wikidata'='Q4975018']['wikipedia'='en:Brooks Island']; ); (._;>;); out meta qt;//['wikipedia wikidata mismatch - wikipedia points to disambiguation page and wikidata does not']
[out:xml][timeout:3600]; ( node(6875925365)['operator:wikidata'='Q4835981']['operator:wikipedia'='en:Bank of the West']; ); (._;>;); out meta qt;//['wikipedia wikidata mismatch - for operator prefixed tags']
JOSM Wikipedia plugin
Note to self: online version hosted at https://matkoniecz.github.io/OSM-wikipedia-tag-validator-reports, files are stored at https://github.com/matkoniecz/OSM-wikipedia-tag-validator-reports.