hopIQ found 10 beers with the same roasted and full-bodied character as Hoepfner Porter. A rare surviving German porter, dark and full-bodied with notes of roasted malt, coffee and dark chocolate. A Karlsruhe speciality with a long history. Ranked by flavour match rather than popularity.
Closest match: Diamond Bear Pig Trail Porter — 91%. No twin in the catalogue yet.
4 countriesmatched across 56 flavour tagsbest match 91%

No beer in the catalogue yet — these come closest.
Close on what matters, with one thing they do differently.
Same idea, less detail — open a beer to see the full comparison.