It's pretty blindingly obvious.
DS9 = B5 (both with a numeric designation even)
Defiant = Whitestar (little prototype ships with a big punch, designed to fight the Borg/Shadows)
Sisko = Sinclair ("He is The One!")
Bajorans = Minbari (strongly religous; "Sisko/Sinclair is The One!")
Odo = Garibaldi (the gruff, streetwise, emotionally shuttered, seen-it-all security chief)
Giant overkill CGI space battles = Giant overkill CGI space battles (both worked on by Foundation Imaging, oddly enough)
Promenade = Zocolo
Wormhole = Jumpgate
And of course DS9 was the first Trek to feature season-long story arcs, something which B5 notable introduced to TV scifi.