Hello and welcome. Sorry it took us so long to respond.
We don't condone repairing an iMac yourself, unless you are an Apple Certified Mac Technician, as there are no internal user-serviceable parts.
That being said, those parts don't look familiar to me. You may be OK, if the iMac is working normally, but you should probably get an Apple Authorized Service Provider to run full hardware diagnostics on it to be sure..
C