4-4 -- How does 5-2 pair up?

We run a 4-4 defense, and are looking at using a change up like the 5-2 in passing situations. I like the cover 2 look also vs. an option as (something to use as well as the 4-4). I like the teaching because the two ILB remain the same. Defensive line teaching still remains similar with the block recognition. My question lies with the safeties. Would they be your OLB types? As stated in previous posts, I don't want to do too much and have the kids think too much and not play enough. We don't have spring ball in Michigan so our contact with the kids is a bit more limited.
Do the two defenses work in tandem very well?

Thanks,
Sunny