"Are on a par" means to be equal or equivalent in terms of importance or quality. Some synonyms for this phrase include the phrases "are the same," "are equal," or "are equivalent." Other synonyms might include the phrases "are evenly matched," "are comparable," or "are identical." These phrases can be used interchangeably depending on the context and the desired effect, helping to convey a sense of balance or equality. Whether used to describe people, things, or ideas, these synonyms can help to establish a sense of equivalence and balance in any conversation or written document.