Shimano HG-70 8 speed cassette to replace Dura Ace 7400???

I am running a DuraAce 7400 8 speed cassette along with mostly DA 7400 components including DA hubs. Need a new cassette and am finding extreme difficulty locating a NOS 7400 so have been looking at alternatives. Not masses of options!

I reckon the closest I can get is a Shimano HG-70 cassette which I think will be compatible but unsure what quality this is and if it is definitely compatible.

Are there any other high quality cassettes than are compatible with 7400?

What sort of quality is the HG-70 cassette? I can see it's almost twice the weight of the DA cassette but can cope with that as long as it works well.

Cheers!

as they drop ranges i.e. 8 speed, then 9 etc the higher quality stuff is the first to go till they end up at the mass market stuff, I guess as most profit. all 8 speed stuff is compatible you only need to worry about capacity of your RD but gaps between the cogs is the same.
https://sheldonbrown.com/cribsheet-spacing.html

Many thanks for that and not surprising that they ditch the higher grade components first. Also good to know that most cassettes are compatible. I'm guessing the HG-70 will work fine.