Many typefaces designed with a pen on paper (especially those from the 20th century) were licensed by different foundries, and were later independently digitized by them. Some special characters such as @ or the euro sign, were independently added later. Those “alternate cuts” are different digital versions of basically the same typeface design. They often vary in character set, letter proportions and kerning. Some are published under different names.
Morris Fuller Benton designed Century Oldstyle between 1908 and 1909. The design echoes the proportions of Century Expanded with its fairly large x-height, short ascenders and descenders, and large capitals, but Century Oldstyle has old style serifs. Century Old Style is still renowned for its readability and is a good typeface for magazines and other publications.