Of course they're different.
When you download the mod and extract it, look inside to see if they have abdata folder, then just simply cut that folder and place it in main game folder. Don't touch anything inside that folder.
View attachment 2699814
View attachment 2699825
Do all the same for the mod as long as it have abdata folder.
I don't know what package of the game you downloaded but make sure check the mod pack 2 from the OP, most of them actually plugins, not mod.
1-More slot ID: Break limit of item ID (without this plugin the game can't read most of mods)
2-DHH: This plugin have many function which I'm not bother to mess with but at least it need for the highheel work.
3-Wideslider: This plugin increase the limit of the parameter you can custom your character.
4-IPA: All plugins can't work without IPA (drag game exe into this IPA to create patch and run the patch to make plugin work). This plugin conflict with BepInEx, so if you using BepInEx, don't use IPA.
Most of repack already have those plugins though, but if you use original game then you must manual install all those plugins.