The quest for general Casik (Belated Justice) and the one for Bera (The Exiled Duke's Affair) result in very similar rewards

The main NPCs from both quests reside in the same cell (Old Ebonheart, Legion Dungeons) and both quests reward the player with an amulet that increases personality and/or speechcraft

 

There are more items in TR that have similar effects, most of which are amulets

 

here's a longer list of kinda similar items, the first two are the one from the quests in OE dungeons, the first four items are amulets:

Amulet of the Advocate - TR_m3_OE_AmuletOfTheAdvocate (Belated Justice)

Beru's Amulet - TR_m3_OE_BeruAmulet (The Exiled Duke's Affair)

Wise Woman's Favor - TR_m4_q_WiseWomansFavor (Wicked Water Woes, this one has it's own "flavour", though)

Amulet of Silver Tongue - TR_m4_TG_SilverTongueAmulet (I thought there's a way to keep tha amulet or to get it later from Meridius but I can't find anything about that on UESP so I'm probably wrong)

Demand - TR_m4_HH_AND_Demand (The Hearing, Andothren Hlaalu)

Supply - TR_m4_HH_And_Supply (The Hearing, Andothren Hlaalu)

Gordol's Smooth Talk - tr_m3_at_tg_lglove (Smuggling Along the Sacred Path, Almas Thirr TG)

 

The next two are exclusive, you can only get one or the other as a reward from "Basement Declaretion" from EEC in OE. Both are amulets but they're a bit different from the rest having also a feather effect

Amulet of Deep Pockets - TR_m3_amuletdeeppockets

Amulet of Horrifying Greed - TR_m3_amulethorrorgreed