303 FN yellow tip

I read in the posts a few days ago of the 30-06 with yellow Tip ,neck seal and primer seal ,I have a couple of questions with regards to 2, 303 cartridges I have, my F N 40 has a yellow Tip and primer seal and a Black neck seal, the other one F N 48 has a Yellow Tip, Yellow neck seal and a Blue/Black primer seal , are they both the same or is one Observation and one Incendiary . Thanks Randy

I have a .303 cartridge with a FN h/s with a clear yellow tip and annulus.
I have mine labelled as a phosphorus incendiary smoke tracer for the Finnish airforce. I have no further information on the round but Im pretty sure it came out of a packet