Man pages matching name jtdiff in section 1:

jtdiff.1.en	debian 10 / jtreg
jtdiff.1.en	debian 11 / jtreg
jtdiff.1.en	debian 11 / jtreg6
jtdiff.1.en	debian 12 / jtreg
jtdiff.1.en	debian 12 / jtreg6
jtdiff.1.en	debian 12 / jtreg7
jtdiff.1.en	debian 13 / jtreg
jtdiff.1.en	debian 13 / jtreg6
jtdiff.1.en	debian 13 / jtreg7