Add a SATA HDD to late 2013 iMac that has PCI-e SSD?

iMac Intel 27" late 2013

OK, having search through most of the questions it seems that users would most often like to upgrade their hard drive to a solid-state drive using the standard SATA connector.

I've read that system with factory installed SSDs have the require PCI-e slot, but if originally equipped with a HHD, the logic board doesn't have that port available.

In my case, I have a late 2013 27" iMac with the PCI-e SSD, but want to add an internal HDD. Did Apple build this logic board with a SATA port for that? I would assume the SSD only and Fushion drive iMacs used the same board, which means it should, but I was looking for someone with a bit of experience with this chassis to confirm it before I begin dissembling it.

Lastly, if so, will this unit require the same temperature adapter as earlier iMac's when using non-Apple sources HDDs?

Thanks so much!

Any thoughts, or was this a dense question?