Drawing difference check

Hi, Is there any way to do a quick visual (either
automated or manual) check to see the difference between
2 drawing revs?. example. Say I have a 2d cable drawing
with a single connector on one end and it splits into 2
connectors on the other end. rev a shows that the "Y" end
both branches are the same length. rev b one of the
connectors gets extended.
I want to be able to overlay both drawings or pdf's of
them and make sure of the changes that were made. Ideally
one drawing color would be yellow the other would be blue
so it would show green where they are the same and blue
or yellow where they are different. I would also like to
do this without having to change the pro/e colors. any
ideas to compare drawings?

thanks

<h1>To Compare a Drawing to a Saved Image File</h1>
You can compare a drawing sheet to a previously saved .pic
file of the sheet. You can compare the whole sheet or use any portion of it in
magnification.

1. <li ="kadov-p-CTopic-Text-Numbered">
   Click Analysis > Compare Sheet to
   Picture. The File Open dialog box opens.
   <li ="kadov-p-CTopic-Text-Numbered">
   Select the .pic file to compare. The pic file is
   "layered" over the drawing page. Common items are suppressed, and any different
   items, either added or deleted, are shown.

1. <li ="kadov-p-CTopic-Text-Numbered">
   To return to the current drawing click
   Repaint.

Note: To save
a drawing sheet in PIC format, use the File > Save As command.

Thanks A lot that is just what I was looking for!