question, would Russian props have had yellow tips ?
Unfortunately it is not easy to answer the question. P-39s delivered to Russia had either the Curtiss Electrics or Aeroproducts props. Both of these props were either with the yellow tips or without them. As a result a pic of of the actual plane is needed. Generally it can be assumed that these P-39s that were sent to the GB and then re-exported to the USSR had the yellow prop tips, plus a number of P-400 Airacobras sent from the USA to Russia directly. The P-39D-2 series had Curtiss propeller with yellow tip. Mass produced P-39 models, P-39N and P-39Q were equipped with Aeroproducts propellers, this may explain why yellow tips were relativelly rare on VVS P-39s.
Here is Pokryshkin in front of unknown P-39. The yellow tips of the prop are noticable.
Capt. I. V. Bochkov of the 19th GIAP in front of his P-400 Aircobra I number "16" in East Carelia in 1942.
Sgt. I. Babak's Р-39D-2 of the 45th IAP , the Spring of 1943
P-39L-1, 298 IAP, Kuban, Korenovskaya airfield, April 1943
And here without the yellow tips...
Pilots of the 101st Guards Fighter Aviation Regiment posing in front of a Bell P-39 Airacobra in Bydgoszcz, Poland.
P-39N Capt N Proshenkov 69GIAP 1944
P-39 Shikunov 69 GIAP