Save and Load in the same game but different places isnt working, why?

There are a couple problems with the two scripts. First in your save script, you must save the value of the instance and not the instance itself.

Additionally in your load script, you must check that the data exists for the player because the player might be joining for the first time.

Finally, it is always best practice to use pcall() on your functions that are part of data store.

Save Script:

local DataStoreService = game:GetService("DataStoreService")
local playerExperienceStore = DataStoreService:GetDataStore("PlayerDS")

function Click (mouse)
    local data = {}
    for k,v in pairs(stats:GetChildren()) do
        data[k] = v.Value 
    end 
    local success , message = pcall(function ()
        PlayerDS:SetAsync(Player.UserId, data)
    end)
    if not success then
        --Error happened with data store
        --Handle error here
    end
end

script.Parent.MouseButton1Down:Connect(Click)

Load Script:

local DataStoreService = game:GetService("DataStoreService")
local playerExperienceStore = DataStoreService:GetDataStore("PlayerDS")

function Click (mouse)
    local success , PlayerData = pcall(function ()
        return PlayerDS:GetAsync(Player.UserId)
    end)
    if success then
        if PlayerData then
            for k,v in pairs(PlayerData) do 
                stats[k].Value = v
            end
        else
            --Player does not have any data saved
            --Best to set stats to default values here
        end
    else 
        --Error happened with data store
        --Handle error here
    end
end

script.Parent.MouseButton1Down:connect(Click)

To use datastore across multiple places, you can either use a GLOBAL DATASTORE, or you can add your PLACES into a UNIVERSE.