Stug IV vs. M-36?

Hello everyone, it's been a while. I haven't had much time to work on models since school started, 4 honors classes and Latin II really take any free time away. But I've gotten lucky and there seems to be a break in the weather, so, as Eisenhower said, "Let's go" . My 16th B-Day was October 25th, (I got 2 models, compliments of my very wonderful girlfriend). Also, I have two 4 day weekends coming up, so I decided to drag out my old M-36 and put it in a dio with my new Stug IV.

Now for the question. Would a shell from the 90mm cannon of the M36 be able to penitrate the frontal armor of a Stug IV? If no, what would a unsuccessful shot look like on the armor? What effect would it have? I know that an American tank crew would have initially gone with an AP round, and if that didn't work, they would have gone with an HE round. The point of the HE round (or so I read in Another River, Another Town) was to basically hit the enemy tank so hard that it would make everything fall apart, like hitting a tin can with a sludge hammer. What would the effects of both of these shells look like (successful and unsuccessful)? Any pics would be greatly appriciated.

Thanks for all the help
Dean