TL;DR for you, yeah kinda, but not really
It’s complicated and I’m kinda new. But as far as I know for your main purpose (cold storage and contact) you could use it.
The DF2 is impressive as you can store a contact with picture.
But no it’s not the same, the DF chips can do some magic the xnt/next cant, e.g. random uid or internal “payments” or be a bus ticket.
Afaik transportation companies could, but dont want to, give you some keys and let you enter the bus with the implant in some cities. (Same problem with everyone else that uses DF2 cards.)
If you plan to build your own secure systems go DF2, for your stated cases a next would be enough, but I believe you can do the same with the DF2 with more storage. So from your view, it might be the same, but in reality the DF2 is a little cooler.
On the other hand the next includes another chip on another frequency which you might find handy some day (work badge or whatever.).
Don’t take this for granted, wait for others to respond. Or just search the forum, all your questions were answered before in some way.
And yeah if I’d choose… I’d pick xSIID ^^.