The ESP32-S3 has 512 KB of SRAM, and the RP2350 has 520 KB of SRAM. The ESP32-S3-WROOM does indeed come in configurations with additional PSRAM, but that would be comparing apples and pears. The WROOM is an entire module complete with program flash, PSRAM, crystal oscillator etc. It comes in a much larger footprint than the actual ESP32-S3, and it is entirely conceivable that one could create a similar module with the same amount of PSRAM using the RP2350.
Furthermore, the added RAM in both cases is indeed PSRAM. That being said, the ESP32-S3 supports octal PSRAM, not just quad PSRAM, which does make a difference for the throughput.
Furthermore, the added RAM in both cases is indeed PSRAM. That being said, the ESP32-S3 supports octal PSRAM, not just quad PSRAM, which does make a difference for the throughput.