I know this is a somewhat ancient thread, but wanted to update it in case anyone else in the future has the same question.
I did indeed get around (finally) to clearing my 'new' headlight housing, and it was pretty much exactly the same as the OEM one I did a while back. The major difference was just like Aaron said - the glue was really tough to loosen up. It was actually pretty tough. I just threw the lens assembly in the oven for 20 minutes at 200*. Once it came out the sealant was good and loose, which made it a breeze to take apart.
2nd difference was the amber/orange reflector has 2 screws inside the housing that held it in place. This was on 'lens' end of the reflector - closest to the middle of the headlight housing itself. I remember the OEM one was just snapped in place with tabs.
I did notice the chrome coating in the housing does look 'cheaper' than the OEM one. It is hard to describe, but it doesn't look as nice as the OEM one. It'* thin in spots, uneven in others, etc... Although, it isn't really noticeable when everything is fully assembled.
Just an FYI for anyone needing/wanting the info...
As a side note - if you have the option for either buying an OEM housing or aftermarket one, don't just base it on cost. I've found that the aftermarket one'* beam pattern to be a little lacking in comparison to the original OEM one. So, if you have the option and are replacing the headlight assembly - go OEM!