Synonyms for the phrase "piece change" could include various phrases such as "modification," "alteration," "adjustment," or "amendment." Other options could include terms like "variation," "adaptation," "revision," "refinement," or "tweaking." Each of these phrases suggests a shift or alteration to a particular element or aspect of something, whether it be a process, a system, or an individual piece. Whether you're talking about changing one piece of a larger puzzle or modifying an entire system, using these different phrases can nuance your language and convey a more precise understanding of what you're trying to describe.