Ask a gunsmith.
Go to Smith and Wesson's website and download/request a manual. Find a bookstore and look for a series of books by J.B. Wood on fireams disassembly.
Standard Catalog of Smith and Wesson, 3rd ed. might have the answer.
Yes, there are the same frame.
If you go to You-Tube and type in disassemble of Smith and Wesson model 915;there should be a video of the steps needed to take down your smith and Wesson semi-auto 9mm.
You can get manuals at the Smith and Wesson website.
If you contact Smith and Wesson directly,they should be able to provide the information that you seek.
Best left to a gunsmith.
Ask a gunsmith for help.
Best to ask a gunsmith for help.
Best left to a gunsmith.
Best left to a trained gunsmith.
Best left to a trained gunsmith.