To add some context, the RAM part is
this one from Micron, which is a 6GB 7500MT/s 64-bit part. They list it as LPDDR5, but 7500MT/s is a LPDDR5X speed, so that may be just how they list things. With a 128-bit bus, two of these parts would give us 12GB of RAM operating at a peak of 120GB/s.
The UFS is a Kioxia part labelled THGJFGT1E45BAILHW0. They don't have a specific page for it, but both
Mouser and
Jak Electronics list it as a 256GB UFS 3.1 part.
Kioxia's website lists a THGJFGT1E45BAIP as a 256GB UFS 3.1, so it may be a revised version of that part.
In both cases, there's a good chance that Nintendo will be sourcing from multiple suppliers, but they'd all match these specs.
Edit: Peak read speeds for UFS 3.1 should be close to 2GB/s, although with both game cards and external storage almost certainly lower than that, I don't know if games could quite use it. Still, it definitely shouldn't be a bottleneck.