What is the primary difference between the upa and the newer rupa?

The Uniform Partnership Act (UPA), which includes revisions that are sometimes called the Revised Uniform Partnership Act (RUPA), is a uniform act (similar to a model statute), proposed by the National Conference of Commissioners on Uniform State Laws ("NCCUSL") for the governance of business partnerships by U.S. States. Several versions of UPA have been promulgated by the NCCUSL, the earliest having been put forth in 1914, and the most recent in 1997.