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As Bob Marlowe has suggested, you can use the "Parametric Product Selector" for searching.
You can select (by checking) the device which you want to compare (Cy8C52, 53, 54, 55) and select "Compare" to compare the features of the selected families. The differentce in Flash Size, number of UDBs, GPIOs and size of SRAM can be compared.
Availability of Delta Sigma ADC apart from the SAR is also one of the major difference among the different devices.