'88 to '90 300E Tranny Swap? Will it Work?

[Bill '90 300E]

So....at 268,000 miles, my tranny went south and I just can't justify spending big $$$ for a new/rebuild. I found a used one from an '88 300E w/125,000 miles. Does anyone know if this is a direct swap project? If it would require mods? If it wouldn't work at all? If no knowledge, do you know where I can find out? I've done the search here and can't seem to find anything directly related.

Your input is appreciated.

Bill