[Boogieman]

The article doesn't say that, but if you look at the images, it is clearly in the same area, just the 1997 image is flipped vertically (the North pole is on the bottom). Both images show the plume at the same latitude, and right in the same place compared to the dark black streak on the surface near the poles:

[SunkenCiv]

The two images from 2012 (March and April) are the same event, so no surprise they’d be in the same place.

The third pic from 1997 has this caption:

“A curious plume-like feature was observed on Mars on 17 May 1997 by the Hubble Space Telescope. It is similar to the features detected by amateur astronomers in 2012, although appeared in a different location.”