Crystal for Ganglion

Hello, everybody!
I was thinking about building an EEG board based on Ganglion. From MCP3912 datasheet, it should be capable of up to 125ksps (which
is a lot).
Ganglion BOM (and KiCad file) has a 3MHz
crystal while the PDF schematic on Github shows a 19MHz one. Does the
crystal choice affect maximum sampling rate? Why did you guys choose to
"downgrade" the crystal?
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