Correct as far as the floppy drive goes... will work but will not be able to be used with the case on, as no, they arent auto-inject whereas the IIci and IIsi are... this said, if it works, you definitely should hold onto it as a testing, go-to and whatever device.
As for the CD-ROM drive, whilst it is correct on both counts that the beige G3 came with a 24x ATAPI CD-ROM, it also was the last desktop Mac to ship with an onboard SCSI controller and has an internal fast-SCSI port and supports SCSI booting. As such, in dire straits there is no reason you could not still use the SCSi device also.
That said, it should also work in a Q630 also.
I hold onto all my working drives as they are getting to an age where they are failing a little more than they once did.