I'm not sure I know what you are asking.
If you're asking if you can connect both "switch boxes" together and plug each into its own respective "turnout" using only one power supply, then the answer is yes.
I believe Bachmann provides this information with their "turnouts".
If you're asking if it's possible to control two "turnouts" with one "switch box", using one power supply, the answer is also yes, provided you remove the plug from the "box" side of one "turnout" and splice the wires to the other.
Do you need both "turnouts" to switch the same way or opposite ways?
If you're asking if you can connect both "switch boxes" together and plug each into its own respective "turnout" using only one power supply, then the answer is yes.
I believe Bachmann provides this information with their "turnouts".
If you're asking if it's possible to control two "turnouts" with one "switch box", using one power supply, the answer is also yes, provided you remove the plug from the "box" side of one "turnout" and splice the wires to the other.
Do you need both "turnouts" to switch the same way or opposite ways?