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I'm starting to think about this a little differently -- your SD card has the app on it from your old phone. Which means the app file(s) are on the SD card when you move it from one device to another. I wonder if Android won't let you move it because the file(s) already exist? Have you tried reformatting the SD card [make sure you have everything backed up, this destroys all data on the card]? Or uninstalling the app while the card is in the old phone? (or "unmove" the app on the old phone?) Or using a new SD card? Basically something to make sure there's nothing that could be conflicting.
As for your second question - no. You can't [easily] open up a phone, and if you did, you'd have to desolder and solder any components you want to change. If you had the smarticles to do this, you probably wouldn't have done a warranty exchange.
Have you tried the suggestions above to see it that works? Please keep us posted. Thank you.