Well... here is what I know.
Naturaly both sports have the potential to injure yourself. Each having some injuries that occur at a higher rate than the other. Now, which occurs more or less often I don't know.
However Olympic lifting demands a greater amount of flexibitly AND strenght at a greather ROM than Power lifting. This is because the movements involved are much complex and demand the body to be "well balanced" in terms of strenght of body parts.
--In PL you can preform any of the 3 movements with a tight upper back. Sure it may hurt ur lifts a little, but u can still do it. In addition you are more prone to create this condition on ur upper back due to benching and DLting. HOWEVER, in OL, it is damn hard to hold a heavy weight overhead when u have a tight upper back. This fact forces you to work on ur flexibility AND get strong at that new ROM too. Therefore you don't really see tight upper backs in OL (exept in bigginers like me). In addition, the movement itself (with a lighter weight & lot of repetitions) helps you increase your ROM and get strong at it too.
--A similar thing happens with the squat. U can have some tightness in ur hips/shins and still box squat heavy, but u ain't gonna back squat ATG even a fraction of that weight if u are tight. Let alone front squat. Is like taking a gym rat who always 1/4 squats and have him 1/2 squat 8-time-out-off-10 he ain't gonna do it.
To the OP (or anyone who thiks I am talking out of my ass) take 95lbs and box squat it, then back squat it (ATG), then Front Squat it (ATG), and finaly Overhead Squat it (ATG). You will see what I mean. (btw if u haven't overhead squated before try with the clean bar 1st).
Now.... in regards to going from PL to OL or not. I suggest you try OL for a while. Take the time to learn the movements, u don't have to stop PL u know. Then once u get the grove of it, start lifting some weights, know a little more about the sport, then make a choice.
Or hell... you can even use the Olifts as part of ur general PL training, it can't hurt (unless u get stupid at it).
my 2 cents...