I know a bit...
Even though I dont have a number, the same thing happened to the 2 K27s that went south.
Yes, After the D&RGW stopped using the k27s, the NdeM (Nationale De Mexico) bought them to run on their NG. After they finnaly abandoned their NG, they didnt want to get rid of their newist and recently fixed up engines, so they converted them to SG, as you see in the picture.
I know I am probobly missing a lot, but this as I know of what happened.