There is no time difference between Luxembourg, Luxembourg and Brazzaville, Congo currently.
Brazzaville doesn't observe daylight saving time but Luxembourg does. DST in Luxembourg started on 31 March 2019 and ended on 27 October 2019. When DST is observed in Luxembourg the time difference between Luxembourg and Brazzaville is 1:0 hour.
See distance from Luxembourg to Brazzaville
8:52 am Sunday, in Luxembourg, Luxembourg is 8:52 am Sunday, in Brazzaville, Congo