Why would it be the same percentage increase? RAM is only one component of the whole machine. "We were going to sell our airplane for $10 million, but one screw doubled in price so now we're selling it for $20 million."
And in both machines a similar percentage of their price is caused by these components.
AMD GPU's are all still basically MSRP. You can get a 9070 for $600 off amazon right now.
I couldn't afford to replace my current NVMe drives (which is why I'm very happy I set everything up with the Samsung 970 Pro, as they're 2-bit drives that will outlast even my grandchildren).
I actually had to RMA some RAM yesterday, and even that has gotten so expensive that it now costs more than my entire computer cost in 2020.