Thank you very much gents for your encouragement
Yes, these two nebulae seem to blend into each other, and I was not at all aware of the fact that one is way further away from us than the other. Thank you Greg for pointing that out. Hopefully the tri-colour version will show it more explicitly.
Okay, the sky is clear at the moment, so it is time for me to get back to work...
EDIT: I have attached a section of master 3nm Ha (7.5h) and 3nm O3 (9.5h) frames, in case anyone would like to see how they differ.