will they use it for another model
As you have basically asked this twice (at least) now, I need to make this perfectly clear.
No manufacture selling new computers, will ever sell a new computer with a used Harddrive in it (even if the Harddrive was only 1 day old, used in another computer)
This would be outrageous, and easily found the history of its usage through its s/n, which is written on the disk not just on the label, but low low level digitally written to the drive. Only the manufacture can wipe this info.
Now in saying that, they
may sell the harddrive at auction (faulty, second hand parts) Which then
may be used in someone's computer, of which that new owner
may try to recover old data from the drive. So there still
may be a issue, especially with any found data.
In this case the manufacture would be at fault, not you! As they were the ones that suppoedly wiped it, then sold it on. Not your fault what they find
Unless you are concerned about your own private data (credit card numbers etc) This would then be
your concern. Note: this hypothetical of recovering your old data is extremely unlikely, and again the warranty manufacture would be at fault.
If it helps at all, I have never heard of such a possibility (from going through warranty that is) happening ever, this includes the last 25years! of history.