PM tests darker than FMU tests?

I tested positive at 10 DPO and started testing twice a day at 12 DPO just to see if there would be much difference. I’ve noticed that my PM test lines look darker than my FMU test lines. Has anyone else experienced this? My beta at 14 DPO was 166 and I am going back for my second draw today.

Link to lineporn image: https://www.reddit.com/r/TFABLinePorn/s/5zveuONDKu