Hello,
I am new to the community as I never have signed up, but I have been lurking for some time now. I can say from my experience, designing levels for consoles compared to PC is mainly your limits in memory and there is more of a standard set limit when targeting say the 360 or PS3, rather with the PC some of these ends are a little looser. For example, level memory has certain limits or particular poly limits on the consoles where they can vary quite differently on PC.
If your talking pure level design in the sense of how big this level should be and how the engagement distances should be set up, yadda yadda. Its almost the same, but keep in mind that typically most console games have smaller amounts of people playing in an MP server than say PC. Luckily for the PC multiplayer games out there, they have dedicated servers which allow for the higher populations to play together.