Here is an amazing discussion of that problem and a description of several metrics that answer your question: https://spectrum.ieee.org/amp/a-better-way-to-measure-progre...

The sram density is a pretty good equivalent. You can arguably do the average of sram and some logic.

If you take the square root of that...you pretty much end up with (modulo a linear scale) the existing nodes.

That gets you size. You then need power and speed, which are a bit trickier to compare without a standard/reference device.