heatsink is missing on the 2nd photo, IrDA missing, and your PRAM battery is missing (which might not be a bad thing considering its a pain in the... back, to find them nowadays).
there should also be some kind of shield that surrounds the CPU card area which is missing on the 2nd photo.
just curious, do they both work? i used to work on a boatload of these in the mid 2000s, so i know a thing or two. granted i had some serious sleep deprivation at that point in time but i do remember that a lot of these machines suffered from power/analog/video problems. that was more common with the first revision (i think called the rev A?) blue imacs and also the slot-loading imacs that were convection-cooled... the latter didn't even have a cooling fan. i still have my revised bondi blue that i got in 2004 from my former high school (a teacher used it, so no pen marks and screen etchings) and it runs great. a lot of the machines i worked on were the A's and the slot loaders from what i recall, so that's why i'm curious. i did have some of the other TLs and those were more reliable.