There are a lot of different ways to set this up, but I'll try to suggest one that will be easiest to implement given your set up. Create one more Array that will keep track of which button is correct. This Array will be the same size as the MovieClip Array. It will have the instance name of the correct button in each position. Here's some sample code:
//I'm assuming the red and green buttons on your stage have instance names of red_btn and green_btn respectively.
var clips:Array = [mc1, mc2, mc3, mc4]; //this is your array of MovieClips that you already have
//This array keeps track of which button is the correct button for each clip
//The first entry goes with the first entry of the clips array
var correctButtons:Array = [red_btn, red_btn, green_btn, red_btn];
//Lastly, you need a variable to keep track of which MovieClip you placed on the stage
var current:Number;
//You have your logic here to put the MC on the stage. Also, update the current variable so you know which MC you added
//I'll just pretend you added the first one (0);
current = 0;
//Events for you buttons:
red_btn.addEventListener(MouseEvent.CLICK, checkButton);
green_btn.addEventListener(MouseEvent.CLICK, checkButton);
function checkButton(e:MouseEvent):void
{
//use the event object to figure out which button was clicked (since they both call the same function
var clickedButton:SimpleButton = e.currentTarget as SimpleButton;
//Grab who the correct button should be from our array
var correctButton:SimpleButton = correctButtons[current];
//Check to see if they are the same
if(clickedButton == currentButton)
{
trace("correct!!!")
}
else
{
trace("wrong!");
}
}