Can I work for Lionbridge and iSoftStone at the same time?

I’ve been offered a position with iSoftStone as an ad evaluator, and I’m a rater for Lionbridge at the moment. I’ve been reading over the terms of employment for Lionbridge and don’t see anything about this, but I thought I would check in here just in case. They’re different positions, aren’t they, so is it alright?