I don’t think so. Eric might’ve mentioned that he was keeping a bit of a written record to go along with the basement tapes, seeing as his journal is very clarifying timeline-wise and documents some of their preparations, but I don’t think he ever showed Dylan an entry out of it. I don’t think Eric knew that Dylan kept a journal at all – let alone what its contents were about.
I have this slightly nutcakes ‘headcanon’ that Eric only really started keeping a journal at the advice of his therapist, to help him document some of his racing thoughts and help him gain insight into his emotions. It’s not an uncommon thing for a therapist to advise in combination with the therapy sessions. The goal of keeping the journal wouldn’t necessarily be to share with anyone, but rather help streamline thoughts and feelings into new insights. Eric’s journal takes on the guise of being intended for an audience, which I think is a blend of his plans for NBK as well as something that felt “safer” for him to write because it would limit his expressions of the emotions he struggled with. He plays with his ideas and thoughts in there – it’s quite experimental, even when his ‘voice’ sounds very assured of himself. It’s something that shows how young he was, really, and how much he still had to learn. He knew that we would one day examine it, as he showcases his writings proudly during his solo moments on the basement tapes.
Dylan’s journal, on the other hand, seems to have been born out of his own need to keep one. It really is a place where he shared his innermost thoughts and feelings without holding back or downplaying them the way he did around other people. I don’t think he ever intended for this to be read. It was something that belonged to him alone: his own private lamentations. His journal was hidden in his room and not something that he intended people to find and publish. I have a hunch that he would be mortified to learn people have spent a great deal of time dissecting what he wrote. I feel like he would write in it during a time when he would be at the point of ‘overflow’, which would explain why its entries often take on a very disjointed narrative that blends many different things together at once. It’s something that reads as more personal than Eric’s journal does, which is why I’m quite certain Eric didn’t even know about its existence. His journal was for Dylan alone.