I see instructions for how to use a 2-1 (white) dimmer switch with an aux switch or a dumb switch, but is it possible to use another 2-1 switch in a 3-way configuration that that both switches in the circuit are 2-1s?
Yes, this is called a 3 way with two smart switches. Note that it does not work with a wire connected to the traveler and you need to use scene control or have a hub that supports binding to bind the second switch to the primary (which controls the load).
See the wiring diagrams here.
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