What is with 4 different prices

There’s a $14.95 and a $19.95 ps5 upgrade what’s the difference. I see in add-ons all of the stuff I purchased already is free download but what is the $5 difference. And if I bought it from prerelease will the 2 prices above get me every thing.
Is the 2 packages
Jungle and Yuchita only for people who don’t own the game yet???
I’m so confused
I get the different more expensive packs but still unsure if it’s something I have to buy being a owner of the ps4 prerelease day one expanded pack and I purchased every possible add on thru the years
Please help clarify this???

$19 is the price for the base version. $14 is the price for the discounted if you already own the PS4 version.

Thank you for a response. Like I said I have owned the game since it was first offered before release and got the 87’ jungle hunter and some other extra crap. Also along the way I have bought all the new people/preds and saw them for free download so I can only imagine the $14 would get me the ps5 upgrade