Hello, my name is Denny and I am a yeast abuser.....
The "rule", as stated, is to not reuse yeast that came from a fermentation over 1.060 and always go from lighter colors to darker ones. Many times over the years I've broken that rule with no negative consequences. As The Professor relates, just try it and see what happens....based on the experiences of many of us, I think you'll get good results.