Using a twin secondary in place of centre tapped transformer
The project I am working on specifies a 12v 0 12v centre tapped transformer. 


So most likely your project will use it to make split supplies (positive and negative) like this:



Your twin secondary transformer can perform the same role, simply connect the secondaries in series, and their connection becomes the center tap. Make sure you connect them the right way around!

Center tapped would be 12-0-12 and yours would be 12-0 and 0-12 !

Twin secondaries are more flexible because you can also put them in parallel to double the current, if you only need one 12V winding.