Canadian .303 Tracer

Can anyone give me some information how to make the difference between MkII and MK IV Tracer.
I thought red tip equal Mk II and white tip equal Mk IV but I’m not sure because normally Mk IV should be with CN bullet!
What about Mk IV (last right); is it possible to find it without paint at the tip?
Regarding this for me:
#1 to 4 are MK II
#5 to 7 are MK IV
Am I right?


Regarding Tony’book I think now #5 and 6 are Tracer G Mark 6 ??