The green one is a Songhua inkstone from Jilin province, carved by Gao Yufa 高玉发 of 紫霞堂 Zixiatang « Rosy Clouds Hall » workshop in Liaoning. This type of stone was promoted by the Qing (Manchu) emperors and also given as an official gift. Your stone in a stone box was made in this « palace style ». Songhua is a hard stone and not easily damaged, hence good to use with potentially gritty ink such as old pine soot.
The other is a Duan inkstone from Zhaoqing, Guangdong, claiming to be from 坑仔岩 « Little Pit » mine. Little Pit ranks among the top three Duanxi mines, although it had the largest output of the 3 and the stone quality varies. It was carved by 谢荣 Xie Rong after a design by 梁焕明 Liang Huanming, founder of 华兴端砚厂 Huaxing Duan Inkstone Factory.
Since these are modern factory stones, it might be a good idea to check what similar new products sell for.
Zixiatang https://mall.jd.com/index-10231681.html
Huaxing http://www.hxduanyan.com