[INM@RLM]

Regarding the identification above of Do 24 N KD+BH as RLM WNr. 5, for anyone wishing to follow the trail through the primary sources, herewith the key references.
It is a story in three parts, all elements coming from the KTB series of the Oberquartiermeister, General der Luftwaffe beim Oberbefehlshaber der Kriegsmarine.

Part One is the four references to KD+BH as WNr. 8, all found in the January 1941 KTB (Bundesarchiv, BArch RM 6/186 Kriegstagebuch Oberquartiermeister: Bd. 17)

KTB ---# -KTB -----KTB Entry --KTB -----WNr. ----Stkz.
----------Page No. Date -------Entry Time
Jan-41 1 -35 ------ 18-Jan-41 --1000 -----8 --No mention
Jan-41 2 -37 ------ 19-Jan-41 --1200 -----8 --No mention
Jan-41 3 -42 ------ 20-Jan-41 --1600 -----8 -- KD+BH
Jan-41 4 -45 ------ 23-Jan-41 --1450 -----8 --No mention
[N.B. Dashes inserted only to produce the correct column alignments.]

The reason no credibility can be attached to these erroneous linkages of KD+BH and WNr. 8 is because the real Do 24 WNr. 8 was not one of the first six Do 24 K-2s delivered to the Germans in the summer of 1940. Consequently it was actually assigned a Stkz. in the KK+UL to KK+UR sequence spanning WNrn. 7 to 13.
And since the regulations introducing the Stkz. system in October 1939 mandated that a single Stkz. be uniquely assigned to each airframe, and remain with it through out its life, there never was any case of two Stkz. assigned to the same airframe either sequentially or simultaneously.