Phono preamps can sound very different. Aside from the accuracy of the RIAA curve applied (or support for other curves), the sound character can vary widely. I would say it quite easy to find phono preamps that sound very different from each other.
A phono preamp is performing frequency response adjustments, and also has an amplification stage. Plus it has a direct and significant interaction with the electrical properties of the cartridge, tonearm, and phono cable. So in some sense it is more complicated, and sensitive, than an integrated amplifier.
A phono preamp is performing frequency response adjustments, and also has an amplification stage. Plus it has a direct and significant interaction with the electrical properties of the cartridge, tonearm, and phono cable. So in some sense it is more complicated, and sensitive, than an integrated amplifier.