Well yes and no.
I use a 25kg Rocna, which I am very happy with. I previously had a 20Kg CQR, which was useless. The 25Kg rocna fits my 2006 B39 cruiser bow roller fine.
For me the older style plough anchors do not set as well or hold as well when set as the newer style. If you are considering a Rocna they have a template for a cardboard one that you can try on your bow roller on the web site.