Ilford’s website did have a comparison chart or description on it when the 5th generation was introduced.
Ah, I now see this on the product description there:
Compared to ILFORD MULTIGRADE IV RC DELUXE - what you need to know
Since the launch of the world's first variable contrast MULTIGRADE paper back in 1940, ILFORD has maintained a long and proud tradition of quality. Launched 25 years after generation 4, this 5th generation paper continues to build on the defining features of its predecessors.
Key differences: Generation 5 has a slightly warmer base tint, better blacks for greater depth, improved mid-grade spacing and a smoother sensometric curve providing more uniform contrast throughout thetonal range.