Well, if i'm mistaken, it still works. I even put a beercan lens on my a-700 (with no adapter) before I posted just to make sure I was right, and it mounted fine, and focused fine. Altho, it IS manual focus etc.
The 1mm difference in flange distance has not caused me any problems.
You might check:
https://en.wikipedia.org/wiki/Minolta_SR-mount for more specifics, and also the entry for the Sony A-mount.
You haven't put an SR mount lens on an A mount body without an adapter .
See this picture .
The top lens is a Minolta MD 85mm f/2 SR mount lens the bottom one a Minolta 28mm f/2 A mount lens .
The mount is two different diameters, so an A mount lens can't physically fit in an SR mount body , and an SR mount lens would fall out of an A mount body .
The locking mechanism is different as well .
The SR mount lens has a notch in one of the bayonet lugs and locks on from the side .
The A mount lens has a recess on the mounting flange where a pin protruding from the cameras flange locks into it .
And finally the aperture mechanisms are in two different places and two very different designs .
You can no more Interchange Minolta/Sony lenses on A mount and SR mount bodies as you can on Canon bodies with FD and EOS lenses without an adapter .
Some people have swapped the lens mounts so a lens fits on another body , in some cases kits were made for some mounts , and the lenses still retain infinity focus .
Nikon F and Pentax K ( with limitations) no problem , as they kept the same physical mount .