[The Chief (tm)]

I would think not. Separate car, separate transaction, separate deals. And obviously interest rates have spiked since June 2022, so all else equal, there would no reason for GMAC to leave higher profit on the table by continuing to offer the low rate.

That said, there are often all sorts of financing products available that are simply not advertised on dealer (or even manufacturer) websites, and can't know what they are until you are there, and you ask. (You'd have to be *really good* to get them to tell you over the phone.) Sometimes they don't seem to make any sense in the "real world", but hey, there are things going on in the background that the lay person is not meant to understand, and if they are financially beneficial, and no hidden tricks, use them to your advantage.

One obvious advantage you already have is that if you trade in the 1LE, and you had financed only half of it, then the "other half" is your equity now, and that would count as a pretty darn good sized down payment towards the new loan. You should be able to secure the absolute lowest rate they can offer since you'd be borrowing only 50/60-ish% of the cost of the new car, instead of 90%.

Good luck. Sounds like a win either way...