Difference between SC and DC: SC have one mixing-stage (SuperHeteroDynamic), DC have two mixing-stages.

SC use a xtal which swings 455kHz lower than the TX-frequency. The bandpassfilter behind makes sure only the right ferquency is passed to dekoding.
DC use a xtal which swings 10,7MHz lower than the TX-frequency. In addition there is a second stage behind this which has a fixed xtal at 10,245MHz thus making (among other mix-products) a signal at 455kHz... same as the SC`s single stage. Having two Superhet-steps do supress some harmonic spyrious from frequencies above our band.

I have never heard anyone using swapable xtals in an ESC... [X(] An ESC is an Electronic Speed Control.
I assume you meant if you can use single conversion xtal in a dualconversion receiver...? The answer to this is short: NO.

(You can of course use the wrong xtal, but it will "receive" signals far from those we use for RC)