The Sirena portafilter is 58mm and the Barista portafilter is smaller at 53mm so the two are not interchangeable.
58mm is a fairly common size in portafilters however, so if you are looking for something different for your Sirena, there are options. Also the Sirena has a rubber disc and peg to function as a self-tamper, those can be removed so you can tamp your own grind and adjust it to your liking.
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