I collect a lot of paperweights and may be able to help. Is the first PW (4 1/2" diam) about 1" thick? If so, here is a picture of one that I have that has the exact same dimensions. It is a little different design, but definitely contemporary. It could have been made by the same artist with a different design. It is also signed. I think it is Nouret KM 13 93? Hard to say if that is the exact name.
I have seen the other signature on the second one and will try to research further. But I think the OG is an American Glass maker. Oregon Glass? Ocean Glass? Or it's the artists initials, DUH......I am sure you have already assumed this.
I will try looking for the OG.
I hope this helps a little.