Convert ufo3 to ufo2

What is the difference between .ufo3 and .ufo2?

Description: UFO3 (Unified Font Object 3) is a file type used for storing font data. It is a cross-platform, open source format that is used to store vector glyphs, font metrics, kerning data, and other related information. UFO3 is the most recent version of the UFO format, and is the standard for font interchange between applications.; UFO2 (Unified Font Object 2) is a file format used for storing digital font data. It is an open source format developed by Adobe that allows for easy exchange of font data between different programs. It stores font outlines, metrics, and other data in XML-based files.