Make sure that PM and Lr are both using the same color label names and the same colors for each label. If you use the standard Lr labels, then you can use the "Adobe" setting in PM. In the General section of PM's preferences, near the color labels, click on the lightning bolt button and choose the Adobe setting.
-Kirk
So, if I understand you correctly, let's say I want to keep my PM Green color tag the same in LR. In PM, Green is no. 5. Does this mean I need to change the no. 5 color in LR (which is purple) to Green in settings? Otherwise, all the PM Greens will turn into Purple in LR... which is definitely not what I want!
If so, what do I do about PM colors that LR does not have? Like Orange? All my color-tagged Selects for this job were made in PM before I considered bringing them into LR. And I have Pinks and Oranges that don't exist in LR. I can make one of those Red in LR, but that still leaves me short of a color. I wish LR had more colors!
Anyway, I could use further help on this issue. Thanks in advance!