What's wrong with having a similar naming schemes?
As much as AMD leads on power/performance and innovation, their marketing and messaging continues to lag. That is what I am pointing out, AMD marketing is lame (as is their naming schemes). They show no leadership. The issue is it diminishes your brand, look at Apple and see how they come up with an independent name for everything, to the point of absurdity.
I have no personal ideas for a better distinguishment for CPUs without a iGPU. Until 7000 Zen it was common to not have a GPU with desktop Zen and a G was added at the end to show it was an "APU"[horrible AMD term] meaning it did have an iGPU. Now with 7000 (Zen 4) AMD is mirroring Intel including iGPU with majority of CPU's and they copy the F modifier. Convoluted word soup, AMD will need to
create a desktop decoder wheel next...