First off, temperatures shouldn't be below 110 with a Savannah. Ideally, you want to shoot for more like 130 degrees. Anything less than 105-110 degrees and they can not digest properly.
Next, I really wouldn't house them together. One is likely bullying and intimidating the other.
What are you using for substrate?
Pinky mice are fine to feed a hatchling, occasionally. If offering him one gets him to start taking food, go ahead. Just keep in mind that Savannah Monitors require a variety in diet.
Please search google, yahoo, whatever search engine you use for "Savannah Monitor Care" and research about these guys! These are complex animals that require time and money to live happy, healthy lives.
A few Care Sheets, etc.
http://savannahmonitor.org
http://www.wnyherp.org/care-sheets/l...ah-monitor.php
http://varanus.nl/
http://www.varanus.net/forums/
I hope your little guys do well for you.