Closest to which previous Joker ?

Obviously not Bat89 as that was set in 1989 so Bruce's parents death must've been around 1959! plus we see Jokers origin/Jack Napier (but it did show joker being way older than Bruce like in this film). But both TDK joker and DCEU joker could correspond with 1981 (ignoring age difference of those jokers but then Ledger/Letos jokers obviously couldve followed in the wake of Phoenix's) i.e that must be around the time of Bale and Affleck Batmen's parents deaths in 80s but obviously we saw those deaths and they weren't the same situations, (esp Begins' Joe Chill as we see the whole thing unlike BvS) although BvS they are coming out a cinema was similar (unlike Begins its a theatre show), but in TDK we know little about jokers origin and was wearing makeup (not bleach skin like Nicolson/Leto) which could tie in with joker'19 whereas in Suicide Squad its implied joker had the traditional acid bath/bleach skin origin

so each of the previous versions of joker has similarities to Joker'19, but Ledger/Leto could be like a copycat of Phoenix's decades later (therefore probably more leto's as that at least had most similar Bruce's parents deaths, plus DCEU was still a thing at the time of Joker'19 so maybe there was some slight/vague effort to make it align ..but not really)