Head following by neck on diffrent rigs types have diffrent results

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#1

So i want to make a npc to follow your head with necks
but i want it to be r6 and for some reason it gives the result i want only in r15
how would i make it have the exact same result as r15 does?
this is the video of the demonstration

R6 Script 
local neck = workspace.Dummy2.Torso.Neck
local NPC = workspace.Dummy2



local cframe0 = neck.C0
while true do
	task.wait()
	local player = workspace:WaitForChild("nikos300") -- i know just for testing
	if player then
			local unit = -(NPC.PrimaryPart.CFrame.p - player.HumanoidRootPart.Position).unit
			neck.C0 = cframe0 * CFrame.new(Vector3.new(0, 0, 0), unit) * CFrame.Angles(0, math.rad(NPC.PrimaryPart.Orientation.Y), 0)
		end
end
R15 Script 
local neck = workspace.Dummy.Head.Neck
local NPC = workspace.Dummy



local cframe0 = neck.C0
while true do
	task.wait()
	local player = workspace:WaitForChild("nikos300") -- i know just for testing
	if player then
			local unit = -(NPC.PrimaryPart.CFrame.p - player.HumanoidRootPart.Position).unit
			neck.C0 = cframe0 * CFrame.new(Vector3.new(0, 0, 0), unit) * CFrame.Angles(0, math.rad(NPC.PrimaryPart.Orientation.Y), 0)
		end
end

I dont care if the head looks behind the npc

#2

bumping because i have gotten no responce

#3

bumping again since no one yet to talk atleast once