Wow...that was a lot of work to prove Michael correct. For all practical purposes when installed in the chassis they're the same size. Perhaps he shouldn't have said "exactly", but his meaning was correct. They are direct replacements for each other. The only dimension they differ in any significant way is overall depth and I'd argue that your measurement from front to back is less important than the measurement from the back of the mounting tabs to the front which I'll bet is DARN close.

Way to send THAT bridge up in flames.