Help Identifying Hungarian Stamps - Errors?

I found these two Hungarian stamps in my collection and cannot find them in my Scott's catalogue. Michel catalog says there are numerous color and printing errors on the 1945 overprint stamps.

I'm thinking the 80f on blue tinted paper could be any of #642/666/672 with a missing overprint.

Similarly the 50f on yellow tinted paper could be any of #654/680/681/690/693 with a missing overprint.

Are these errors? Are they referenced in any catalogue? Value?

Yes, I came across these myself, a few years ago, I made an Album page, but dashed if I can find it.

They exist, but were not issued so without overprint. (no value offered)

Steiner Page 8.

Michel notes that copies without overprint are from printers' waste.