Adding Team Only?

You would want to check if the player's TeamColor is equal to the TeamColor of the team you want. This can be achieved with a simple if statement.

local TeamName = "TEAMNAMEHERE" --Change TEAMNAMEHERE to the name of your team. We will be using this in the if statement below.

function ChangeMe(hit)
    if hit.Parent == nil then return end
    if (hit.Parent:findFirstChild("Humanoid") == nil) then return end
    local human = hit.Parent:findFirstChild("Humanoid") 
    local char = hit.Parent
    local player = game.Players:GetPlayerFromCharacter(hit.Parent)
    if human and not debounce and player and game.Teams:FindFirstChild(TeamName) and player.TeamColor == game.Teams[TeamName].TeamColor then --Checks if human is not nil, deboune is false, player is not nil, the team you want is not nil and if the player's TeamColor equals the team's TeamColor. The TeamColor will be different depending on the name of the team.
        debounce = true
        originals = char:getChildren()
        for w = 1, #originals do
            if originals[w].className == "CharacterMesh" then
                originals[w]:remove()
            end
        end
        meshes = script:getChildren()
        for y = 1, #meshes do
            copy = meshes[y]:clone()
            copy.Parent = char
        end
    end
    wait(0)
    debounce = false
end

script.Parent.Touched:connect(ChangeMe)

I hope my answer helped you. If it did, be sure to accept it.