Citadel of Cassiopus green/purple doors and keys

[otg]

in rooms 15717 and 15916 there are two green and two purple doors, respectively. I have played this mansion in all three modes and I seem to lack a key to open one of the doors in either color. I don't mind leaving the purple one since there's only a map behind it, but the green one is annoying, I have to choose between a backpack and some money bags. Don't like to choose... Haven't seen another green key around anywhere

Am I missing something?