Some KGr 506 code+WNr pairs from 1941 - exact subtypes?

[Seaplanes]

When Gruppe 506 converted to Ju 88 from February 1941, the Staffel 2./906 was part of the unit. On 15.2.1941 the Staffeln were distributed as follows:
Stab Gruppe 506 in Norderney
1./506 in Norderney under Gruppe 506 to commence conversion to Ju 88.
2./506 in Brest under Gruppe 406 with He 115.
3./506 in Stavanger under Gruppe 706 with He 115.
2./906 in Hörnum under Gruppe 506 with BV 138.

For practical reasons, the 2./906 was converted to Ju 88 along with 1./506 and 3./506 with 2./506 still with its He 115s in Brest.

On 27.09.1941 the following order was issued by Genst.Gen.Qu. 2.Abt. Nr. 7800/41:
1. With effect from 6.10.1941 the Kü.Fl.Staffel 2./906 (Ju 88) is renumbered 2./506, and the Kü.Fl.Staffel 2./506 (He 115) in 2./906.
At the same time the 3. Erg.Staffel (Ju 88)/Fl.Erg.Gr.See was renamed Ergänzungsstaffel/Kü.Fl.Gruppe 506.

It was customary to report only the individual aircraft letter of the Unit code in the KTBs. I.e. S4+AH was reported A/506 or AH/506.
The three letters tactical code was normally used only on transport aircraft, and to my knowledge never used in the Küstenflieger units.