The options in the rules have been sadly reduced since that box came out.
A close combat weapon would be any of the more basic looking knives in the box. If I remember correctly there used to be various upgrades available for having either a power sword or an agoniser (which is the whip, by the way - not a tentacle!) - but I think they've now just been rolled into 'sybarite weapon'. So you could use either to represent this.
This is why people are saying wait for the codex. I think most of us are hoping we get some of these options back again - but I think that ship has probably sailed.
As for the blast pistol. Blast pistol is a blast pistol. It's a pistol version of a blaster?
Finally - no need to use wahapedia. The Drukhari index is freely available to download from Warhammer Community. Might help you more - don't know how the data is organised on wahapedia...
https://www.warhammer-community.com/wp-content/uploads/2023/06/HHuRBpCqowBLoh6z.pdf