[SnowmanDK]

Thanks for the replies
I was sure I tried it, but I guess I made some mistake...
This is the solution (using my first code example as template):

local pinLayout_QuestsDone = {
    maxDistance = savedVariables.pinTextureQuestsDone.maxDistance,
    level = savedVariables.pinTextureQuestsDone.level,
    texture = pinTextures.Quests[savedVariables.pinTextureQuestsDone.type],
    size = savedVariables.pinTextureQuestsDone.size,
    tint = ZO_ColorDef:New(unpack(savedVariables.pinTextureQuestsDone.tint)),
    additionalLayout = {
        function(pin)
            pin:GetNamedChild("Background"):SetColor(unpack(savedVariables.pinTextureQuestsDone.tint))
        end,
        function(pin)
            pin:GetNamedChild("Background"):SetColor(1,1,1,1)
        end,
    },
}
 
LMP:AddPinType(PINS_QUESTS_DONE, Quests_Done_pinTypeCallback, nil, pinLayout_QuestsDone, pinTooltipCreator)
COMPASS_PINS:AddCustomPin(PINS_QUESTS_DONE, Quests_CompassPins, pinLayout_QuestsDone)
COMPASS_PINS:RefreshPins(PINS_QUESTS_DONE)

Case closed