The phrase "is on a par with" implies that something is equal or equivalent to something else in terms of quality, standard, or importance. There are many alternative phrases that convey a similar meaning, including "is comparable to," "is equivalent to," "is similar to," "is just as good as," "is identical to," "rivals," or "matches." These phrases can be used interchangeably and allow writers to add variation to their language. By using synonyms, you can avoid repetition and bring a more dynamic tone to your writing, making it more interesting and engaging for your readers.