Nah, not that I know of…? (but I could be totally wrong, when was it ever said that Kaneki’s kagune was hard as steel? Eating Yamori strengthened it for sure but Sasaki’s Kagune should be in the same state, especially considering how high his RC cells rate is?)
We now know thanks to Eto that a Kagune’s form is mostly because of the ghoul’s imagination but when it comes to Sasaki’s kagune I don’t think it’s weaker than Kaneki and I don’t think that Sasaki is weaker than Kaneki either.
For now all I can say is that Sasaki is less crazy than Kaneki until the Anteiku raid arc was. I mean, we haven’t seen the Centipede yet, which means all we saw in :Re is his Kagune and not the half-Kakuja form driven by his deepest sadness, madness and overwhelming need to protect people he loves (in order not to be left alone), so even though Kakujas are crazier and stronger, I really think that Sasaki and Kaneki from the Anteiku raid arc have the same strength. 🙂
And Tsukiyama seems to agree as well…

But that’s just me, especially since I can’t remember when it was said that his Kagune was as hard as steel (does Anon or anyone else have a link?).
Sorry it doesn’t help so much, Anon.

