@Gcort49-
The Rokus themselves are identical.
Streaming Stick 4K comes with the standard Voice Remote (replaceable batteries, headphone jack).
Streaming Stick 4K+ comes with the Voice Remote Pro (rechargeable battery, option to keep microphone active at all times for hands-free voice control, two programmable shortcut buttons, verbal "find my remote" feature, but no headphone jack).
Roku Community Streaming Expert
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X