Can I use Rogaine and Rapidbrow on my eyebrows at the same time?

I have very thin, sparse, and light eyebrows. Recently, I've decided that I want to grow them out. I read good reviews online about Rapidbrow, so I ordered it and have been using it for a couple days now. I also have some Rogaine I purchased, and I was wondering if it is okay to use both products on my eyebrows at the same time. If it is, when would be the best time to apply them? Should I do the Rapidbrow in the morning/night and the Rogaine in the afternoon? Also, do they actually work?