I'm sorry I don't know about the 'exchange-ability' of 12v and 24v. I do know that it's the 'step down' transformer that takes you from 120v to 24 or 12 - if all your other actuators are 12v, you have a 10:1 transformer - for a 24v you'd need a 5:1.
Perhaps there is a transformer that can go on the one line, but I don't know.
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