Yes, Amazon has very confusing version naming.
The Fire Stick gen 1 - not to be confused with the Basic edition first released! - has “voice remote” but not “Alexa voice remote” of gen 2, though as far as I can tell the remotes and capabilities are in fact identical. The difference is that gen 2 can be connected to an ethernet adapter and gen 1 cannot (has only wifi); otherwise identical, I think.
The Fire Stick 4K has Dolby Atmos instead of the earlier Digital Plus and can handle 5.1 sound (as well as 4k video), and is considerably physically larger with its more powerful processor.
It’s possible to buy separately the new remote control which has an IR blaster to turn on-off and volume up-down on many devices, and use that with existing Fire Sticks.
This is all separate from the “Fire TV” box models (gen 1 and gen 2), the “gen 3” pendant, and the Fire TV Cube.
Jack, is the 4K Stick working smoothly with Tablo?