Single-striped Grass Mouse?

Single-striped Grass Mouse?

Observation - Single-striped Grass Mouse? - Global. Description: These two photos were taken in the same place 3.5 years apart of mice running around at the exit of Serengeti that heads towards Oldupai Gorge. My best guess is Single-striped Grass Mouse, but I'm not confident there.

These two photos were taken in the same place 3.5 years apart of mice running around at the exit of Serengeti that heads towards Oldupai Gorge.

My best guess is Single-striped Grass Mouse, but I'm not confident there.