Thank you guys!
Chris, your pics were very helpful. RLM 45 or Fliegerlack 7130 should look something like redbrown.
I found a very interesting source at
www.rlm-farben.de
Go to Quellen and than download
Oberflächenschutzverfahren und Anstrichstoffe
The source doesn't help with the colour, but it's to read that the final coat of the Fliegerlackkette 30 could have different RLM colours. (00/ /02/04/11/21/22/23/24/25/26/27/28/41/42/61/62/63/64/65/66/ 67/68/69/70/71)
Also see Oberflächenschutzverfahren und Anstrichstoffe der deutschen Luftfahrtindustrie und Luftwaffe 1935-1945 by Michael Ullmann page 208.
So I think its impossible to answer my question. I think I will paint the nose of the He 162 W.Nr 120231 "White 6" in RLM 70. Very strange is that the He 162 that were built in Bernburg (310027) had a very light nose, as maybe RLM 21 or RLM 67
Cheers, Simon