There are more differences than just caps and control being swapped. But the image captures it fairly well. Notice that ESC is next to the 1 key, the place where backspace normally is now has two keys: \|, `~ (from left to right), where backslash normally lives is backspace.
Also, for whatever it's worth, it's 1 more key than the corresponding ANSI layout. A 101 key ANSI would normally be a 102 key UNIX. Where the ESC normally is located, you have a "dead" key, that is often system dependantly mapped.
Also, on the older UNIX full keyboards, it's quite common to have a + arrow arrangement, and an extra key around the numpad, with + no longer being 2 keys tall, similar to the 122 key terminal keyboards.
Edit: If you want to see full keyboards in that layout, look for "Sun Type #", where # is a number from 3-6. The Type 7 has both UNIX and ANSI layouts available, which is why I left that out.
Edit 2: See, why did you have to go editing your post after I typed this all up?