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Although Cisco's IOS image page lists all known models, often they all run the same physical image.
Besides being the same file size, are the files also named alike? Have you run a file comparison utility against them?
Community Feedback Forum is dedicated to "Tell us your opinions, suggestions, concerns, and feedback on the new Cisco Support Community". You are off-topic here, don't expect a valuable response. Please delete the thread here (big red button on top) and recreate it in proper community according specific Cisco technology or solution in question. Consider LAN, Switching and Routing ...
Thank you.