Nope. But, the good news is that they won't charge you more if the price goes up !

I'm presuming that your "Z" ticket is non-refundable. If it's refundable, simply cancel it and buy the new cheaper ticket.

If it's not, you can cancel the existing ticket and use the value of that ticket less a $200 penalty to purchase the new ticket. Any balance will be in the form of a credit for future travel.

Thus, if the price dropped by $225, you will wind up with a net credit of $25 for use within a year.