The difference* between Vega 7 ( 5600g ) and Vega 8 ( 5700g) is about 4%.
The difference* between Vega 11 ( 3400g ebay findable ) and Vega 8 ( 5700g ) is about 16% in Vega 8's favor.
*
https://www.tomshardware.com/reviews/amd-ryzen-5-5600g-review/3
That 4% difference could simply be from the faster 5700g CPU rather then the iGPU.
I would argue the 3400g is previous gen. I did not include it as a budget option as I could not find it new. Looks to be about $180 on ebay used.
But yes, it certainly appears that AMD is planning to do the same thing for some silly reason. The high end skews do not need the nice iGPU, any old just in case iGPU would be fine.
It is the lower end that needs it desperately.