The will work, but it's considered an "off label" use which has other implications.
I am currently using both the Harpoons (aka Sof-sensor) & Enlite with a Paradigm Revel 723. So, yes, Enlites will work with the "older" pumps which supported the Sof-sensor.
When I spoke with a Medtronic customer support rep a week & 1/2 ago (Dec 21) I was told that using the Enlite with any Medtronic pump other than the 530g is considered "off label" by either Medtronic or maybe the FDA or possibly both.
What does this mean? It means Medtronic will not (physically) support you if you have problems with the Enlite unless they have a record in their files that a doctor has prescribed the Enlite for you. In other words, your "off label" use of the Enlite product has to have been approved by your physician for Medtronic to play along with it.
From my own experience, feel free to call their support line and ask for help. They'll probably be glad to talk to you. Heck, they talked to me for over a 1/2 hour and not only do I NOT have a script on file but, in fact, the Enlite I was using was a tad over a month past the expiration date on the box. They still listened politely and tried to offer helpful suggestions.
Just don't expect them to offer to send you a replacement for a failed Enlite sensor unless Medtronic has your script for Enlites in their records.
I have no idea how one goes about getting a script "on file". Most likely the script provided/required if you order supplies directly from Medtronic will cover it. However, I do not get my pump supplies directly from Medtronic, so I'm not sure what I'll need to do. But I'm not going to try to tackle that question until everyone is back from their holiday vacations. ;-)
T1 LADA ~1980; 1st pump: Minimed 507; May 2013: Paradigm 723 + CGM