Hello. The most important thing with Ottoman coins is the numbering/date system. You can acquaint yourself here. https://en.numista.com/numisdoc/calendar-islamic-30.html
So for the first coin I see a date of 1255 (١٢٥٥) and a denomination of 20 (٢٠), with a regnal year of 21 (٢١) . A search gives this.
For the second coin I see a year of 1277 (١٢٧٧) and a denomination of 20 (٢٠), with a regnal year of 1 (١). A Search gives this.