https://wccftech.com/amds-rdna2-next-generation-architecture-is-not-identical-to-xbox-series-x-or-ps5/

Architectural reveals of the next-generation consoles have had enthusiasts discussing AMD's upcoming RDNA2 architecture with much gusto and has started the inevitable speculation on how RDNA2 will translate into next-generation Radeon graphics cards. Unfortunately, or fortunately, a source intimately familiar with the matter tells me that AMD's RDNA2 implementation for its upcoming graphics cards is not comparable to the next generation console's at all.

There is a very good reason why both the PS5 and Xbox Series X have listed the architecture used as "custom RDNA2" instead of just "RDNA2". This is a point that AMD wanted to drive home and specifically insisted on. They do not want gamers confusing the RDNA2 used in the XSX and PS5 with that of the upcoming Radeon cards, therefore the "custom" prefix. To be clear, my source did not say how it would be different, but I did feel the implication was that AMD's RDNA2 implementation for Radeon GPUs will be superior.